1.  The bottom or lower part of any room; the part upon which we stand and upon which the movables in the room are supported. [1913 Webster]

2.  The structure formed of beams, girders, etc., with proper covering, which divides a building horizontally into stories. Floor in sense 1 is, then, the upper surface of floor in sense 2. [1913 Webster]

3.  The surface, or the platform, of a structure on which we walk or travel; as, the floor of a bridge. [1913 Webster]

4.  A story of a building. See Story. [1913 Webster]

5.  The part of the house assigned to the members. [1913 Webster]
" Instead of he has the floor, the English say, he is in possession of the house." [1913 Webster]

6.  That part of the bottom of a vessel on each side of the keelson which is most nearly horizontal. [1913 Webster]

7.  The rock underlying a stratified or nearly horizontal deposit. Raymond. [1913 Webster]

1.  To cover with a floor; to furnish with a floor; as, to floor a house with pine boards. [1913 Webster]

2.  To strike down or lay level with the floor; to knock down; hence, to silence by a conclusive answer or retort; as, to floor an opponent. [1913 Webster]
"Floored or crushed by him." [1913 Webster]

3.  To finish or make an end of; as, to floor a college examination. [1913 Webster]
"I've floored my little-go work." [1913 Webster]

floor, n. & v.
--n.
1 a the lower surface of a room. b the boards etc. of which it is made.
2 a the bottom of the sea, a cave, a cavity, etc. b any level area.
3 all the rooms etc. on the same level of a building; a storey (lives on the ground floor; walked up to the sixth floor).
4 a (in a legislative assembly) the part of the house in which members sit and from which they speak. b the right to speak next in debate (gave him the floor).
5 Stock Exch. the large central hall where trading takes place.
6 the minimum of prices, wages, etc.
7 colloq. the ground.
--v.tr.
1 furnish with a floor; pave.
2 bring to the ground; knock (a person) down.
3 colloq. confound, baffle (was floored by the puzzle).
4 colloq. get the better of; overcome.
5 serve as the floor of (leopard skins floored the hall).

Idiom:
first (US second) floor the floor above the ground floor. floor-lamp US a standard lamp. floor-leader US the leader of a party in a legislative assembly. floor manager 1 the stage manager of a television production.
2 a shopwalker. floor plan a diagram of the rooms etc. on one storey of a building. floor-polish a manufactured substance used for polishing floors. floor show an entertainment presented on the floor (as opposed to the stage) of a nightclub etc. floor-walker US a shopwalker. from the floor (of a speech etc.) given by a member of the audience, not by those on the platform etc.
take the floor
1 begin to dance on a dance-floor etc.
2 speak in a debate.

Derivative:
floorless adj.

Etymology:
OE flor f. Gmc

VB  succeed, be successful, gain one's end, gain one's ends, crown with success, gain a point, attain a point, carry a point, secure a point, win a point, win an object, get there, manage to, contrive to, accomplish, do wonders, work wonders, make a go of it, come off well, come off successful, come off with flying colors, make short work of, take by storm, carry by storm, bear away the bell, win one's wings, win one's spurs, win the battle, win the day, carry the day, gain the day, gain the prize, gain the palm, have the best of it, have it all one's own way, have the game in one's owns hands, have the ball at one's feet, have one on the hop, walk over the course, carry all before one, remain in possession of the field, score a success, speed, make progress, win one's way, make one's way, work one's way, find one's way, strive to some purpose, prosper, drive a roaring trade, make profit, reap the fruits, gather the fruits, reap the benefit of, reap the harvest, strike oil, gain a windfall, make one's fortune, get in the harvest, turn to good account, turn to account, triumph, be triumphant, gain a victory, obtain a victory, gain an advantage, chain victory to one's car, nail a coonskin to the wall, surmount a difficulty, overcome a difficulty, get over a difficulty, get over an obstacle, se tirer d'affaire, make head against, stem the torrent, stem the tide, stem the current, weather the storm, weather a point, turn a corner, keep one's head above water, tide over, master, get the better of, have the better of, gain the better of, gain the best of, gain the upper hand, gain the ascendancy, gain the whip hand, gain the start of, distance, surpass, defeat, conquer, vanquish, discomfit, euchre, overcome, overthrow, overpower, overmaster, overmatch, overset, override, overreach, outwit, outdo, outflank, outmaneuver, outgeneral, outvote, take the wind out of one's adversary's sails, beat, beat hollow, rout, lick, drub, floor, worst, put down, put to flight, put to the rout, put hors de combat, put out of court, silence, quell, nonsuit, checkmate, upset, confound, nonplus, stalemate, trump, baffle, circumvent, elude, trip up, trip up the heels of, drive into a corner, drive to the wall, run hard, put one's nose out of joint, settle, do for, break the neck of, break the back of, capsize, sink, shipwreck, drown, swamp, subdue, subjugate, reduce, make the enemy bite the dust, victimize, roll in the dust, trample under foot, put an extinguisher upon, answer, answer the purpose, avail, prevail, take effect, do, turn out well, work well, take, tell, bear fruit, hit it, hit the mark, hit the right nail on the head, nick it, turn up trumps, make a hit, find one's account in.

N  layer, stratum, strata, course, bed, zone, substratum, substrata, floor, flag, stage, story, tier, slab, escarpment, table, tablet, dess, flagstone, board, plank, trencher, platter, plate, lamina, lamella, sheet, foil, wafer, scale, flake, peel, coat, pellicle, membrane, film, leaf, slice, shive, cut, rasher, shaving, integument, eschar, stratification, scaliness, nest of boxes, coats of an onion, monolayer, bilayer, trilayer, lamellar, lamellated, lamelliform, layered, laminated, laminiferous, micaceous, schistose, schistous, scaly, filmy, membranous, pellicular, flaky, squamous, foliated, foliaceous, stratified, stratiform, tabular, discoid, spathic, spathose, trilamellar, graphitic.

N  base, basement, plinth, dado, wainscot, baseboard, mopboard, bedrock, hardpan, foundation, substructure, substratum, ground, earth, pavement, floor, paving, flag, carped, ground floor, deck, footing, ground work, basis, hold, bilge, bottom, nadir, foot, sole, toe, hoof, keel, root, centerboard, bottom, undermost, nethermost, fundamental, founded on, based on, grounded on, built on.

N  horizontality, flatness, level, plane, stratum, dead level, dead flat, level plane, recumbency, lying down, reclination, decumbence, decumbency, discumbency, proneness, accubation, supination, resupination, prostration, azimuth, plain, floor, platform, bowling green, cricket ground, croquet ground, croquet lawn, billiard table, terrace, estrade, esplanade, parterre, table land, plateau, ledge, butte, mesa (plain), level, spirit level, horizontal, level, even, plane, flat, flat as a billiard table, flat as a bowling green, alluvial, calm, calm as a mill pond, smooth, smooth as glass, recumbent, decumbent, procumbent, accumbent, lying, prone, supine, couchant, jacent, prostrate, recubant, horizontally, on one's back, on all fours, on its beam ends.

VB  be horizontal, lie, recline, couch, lie down, lie flat, lie prostrate, sprawl, loll, sit down, render horizontal, lay down, lay out, level, flatten, prostrate, knock down, floor, fell.

N  support, ground, foundation, base, basis, terra firma, bearing, fulcrum, bait, caudex crib, point d'appui, pou sto, purchase footing, hold, locus standi, landing place, landing stage, stage, platform, block, rest, resting place, groundwork, substratum, riprap, sustentation, subvention, floor, supporter, aid, prop, stand, anvil, fulciment, cue rest, jigger, monkey, stay, shore, skid, rib, truss, bandage, sleeper, stirrup, stilts, shoe, sole, heel, splint, lap, bar, rod, boom, sprit, outrigger, ratlings, staff, stick, crutch, alpenstock, baton, staddle, bourdon, cowlstaff, lathi, mahlstick, post, pillar, shaft, thill, column, pilaster, pediment, pedicle, pedestal, plinth, shank, leg, socle, zocle, buttress, jamb, mullion, abutment, baluster, banister, stanchion, balustrade, headstone, upright, door post, jamb, door jamb, frame, framework, scaffold, skeleton, beam, rafter, girder, lintel, joist, travis, trave, corner stone, summer, transom, rung, round, step, sill, angle rafter, hip rafter, cantilever, modillion, crown post, king post, vertebra, columella, backbone, keystone, axle, axletree, axis, arch, mainstay, trunnion, pivot, rowlock, peg, tiebeam, thole pin, board, ledge, shelf, hob, bracket, trevet, trivet, arbor, rack, mantel, mantle piece, mantleshelf, slab, console, counter, dresser, flange, corbel, table, trestle, shoulder, perch, horse, easel, desk, clotheshorse, hatrack, retable, teapoy, seat, throne, dais, divan, musnud, chair, bench, form, stool, sofa, settee, stall, arm chair, easy chair, elbow chair, rocking chair, couch, fauteuil, woolsack, ottoman, settle, squab, bench, aparejo, faldstool, horn, long chair, long sleeve chair, morris chair, lamba chauki, lamba kursi, saddle, pannel, pillion, side saddle, pack saddle, pommel, bed, berth, pallet, tester, crib, cot, hammock, shakedown, trucklebed, cradle, litter, stretcher, bedstead, four poster, French bed, bunk, kip, palang, bedding, bichhona, mattress, paillasse, pillow, bolster, mat, rug, cushion, footstool, hassock, tabouret, tripod, monopod, Atlas, Persides, Atlantes, Caryatides, Hercules, supporting, supported, fundamental, dorsigerous, astride on, straddle.

dance floor, first floor, floor board, floor cover, floor covering, floor joist, floor lamp, floor leader, floor plan, floor show, floor wax, ground floor, mezzanine floor, ocean floor, on a higher floor, on a lower floor, parquet floor, price floor, privilege of the floor, shop floor, take the floor, threshing floor, trading floor, wage floor