1.  vestibule(n = noun.artifact) antechamber, anteroom, entrance hall, foyer, hall, lobby - a large entrance or reception room or area;
is a kind of room
is a part of building, edifice
has particulars: narthex

2.  vestibule(n = noun.body) - any of various bodily cavities leading to another cavity (as of the ear or vagina);
is a kind of bodily cavity, cavity, cavum
has particulars: vestibule of the ear, vestibule of the vagina
Derived form adjective vestibular₁

   The porch or entrance into a house; a hall or antechamber next the entrance; a lobby; a porch; a hall. [1913 Webster]

   To furnish with a vestibule or vestibules. Brander Matthews. [Webster 1913 Suppl.]

vestibule, n.
1 a an antechamber, hall, or lobby next to the outer door of a building. b a porch of a church etc.
2 US an enclosed entrance to a railway-carriage.
3 Anat. a a chamber or channel communicating with others. b part of the mouth outside the teeth. c the central cavity of the labyrinth of the inner ear.

Derivative:
vestibular adj.

Etymology:
F vestibule or L vestibulum entrance-court

N  beginning, commencement, opening, outset, incipience, inception, inchoation, introduction, alpha, initial, inauguration, debut, le premier pas, embarcation, rising of the curtain, maiden speech, outbreak, onset, brunt, initiative, move, first move, narrow end of the wedge, thin end of the wedge, fresh start, new departure, origin, source, rise, bud, germ, egg, rudiment, genesis, primogenesis, birth, nativity, cradle, infancy, start, inception, creation, starting point, dawn, evolution, title-page, head, heading, van, caption, fatihah, entrance, entry, inlet, orifice, mouth, chops, lips, porch, portal, portico, propylon, door, gate, gateway, postern, wicket, threshold, vestibule, propylaeum, skirts, border, first stage, first blush, first glance, first impression, first sight, rudiments, elements, outlines, grammar, alphabet, ABC, beginning, initial, initiatory, initiative, inceptive, introductory, incipient, proemial, inaugural, inchoate, inchoative, embryonic, rudimental, primogenial, primeval, primitive, primordial, aboriginal, natal, nascent, first, foremost, leading, maiden, begun, just begun, at the beginning, in the beginning first, in the first place, imprimis, first and foremost, in limine, in the bud, in embryo, in its infancy, from the beginning, from its birth, ab initio, ab ovo, ab incunabilis, ab origine, let's get going!, let's get this show on the road!, up and at 'em!, aller Anfang ist schwer, dimidium facti qui coepit habet, omnium rerum principia parva sunt.

N  receptacle, inclosure, recipient, receiver, reservatory, compartment, cell, cellule, follicle, hole, corner, niche, recess, nook, crypt, stall, pigeonhole, cove, oriel, cave, capsule, vesicle, cyst, pod, calyx, cancelli, utricle, bladder, pericarp, udder, stomach, paunch, venter, ventricle, crop, craw, maw, gizzard, breadbasket, mouth, pocket, pouch, fob, sheath, scabbard, socket, bag, sac, sack, saccule, wallet, cardcase, scrip, poke, knit, knapsack, haversack, sachel, satchel, reticule, budget, net, ditty bag, ditty box, housewife, hussif, saddlebags, portfolio, quiver, chest, box, coffer, caddy, case, casket, pyx, pix, caisson, desk, bureau, reliquary, trunk, portmanteau, band-box, valise, grip, grip sack, skippet, vasculum, boot, imperial, vache, cage, manger, rack, vessel, vase, bushel, barrel, canister, jar, pottle, basket, pannier, buck-basket, hopper, maund, creel, cran, crate, cradle, bassinet, wisket, whisket, jardiniere, corbeille, hamper, dosser, dorser, tray, hod, scuttle, utensil, brazier, cuspidor, spittoon, cistern, vat, caldron, barrel, cask, drum, puncheon, keg, rundlet, tun, butt, cag, firkin, kilderkin, carboy, amphora, bottle, jar, decanter, ewer, cruse, caraffe, crock, kit, canteen, flagon, demijohn, flask, flasket, stoup, noggin, vial, phial, cruet, caster, urn, epergne, salver, patella, tazza, patera, pig gin, big gin, tyg, nipperkin, pocket pistol, tub, bucket, pail, skeel, pot, tankard, jug, pitcher, mug, pipkin, galipot, gallipot, matrass, receiver, retort, alembic, bolthead, capsule, can, kettle, bowl, basin, jorum, punch bowl, cup, goblet, chalice, tumbler, glass, rummer, horn, saucepan, skillet, posnet, tureen, beaker, flask, Erlenmeyer flask, Florence flask, round-bottom flask, graduated cylinder, test tube, culture tube, pipette, Pasteur pipette, disposable pipette, syringe, vial, carboy, vacuum flask, Petri dish, microtiter tray, centrifuge tube, bail, beaker, billy, canakin, catch basin, catch drain, chatti, lota, mussuk, schooner, spider, terrine, toby, urceus, plate, platter, dish, trencher, calabash, porringer, potager, saucer, pan, crucible, glassware, tableware, vitrics, compote, gravy boat, creamer, sugar bowl, butter dish, mug, pitcher, punch bowl, chafing dish, shovel, trowel, spoon, spatula, ladle, dipper, tablespoon, watch glass, thimble, closet, commode, cupboard, cellaret, chiffonniere, locker, bin, bunker, buffet, press, clothespress, safe, sideboard, drawer, chest of drawers, chest on chest, highboy, lowboy, till, scrutoire, secretary, secretaire, davenport, bookcase, cabinet, canterbury, escritoire, etagere, vargueno, vitrine, chamber, apartment, room, cabin, office, court, hall, atrium, suite of rooms, apartment, flat, story, saloon, salon, parlor, by-room, cubicle, presence chamber, sitting room, best room, keeping room, drawing room, reception room, state room, gallery, cabinet, closet, pew, box, boudoir, adytum, sanctum, bedroom, dormitory, refectory, dining room, salle-a-manger, nursery, schoolroom, library, study, studio, billiard room, smoking room, den, stateroom, tablinum, tenement, bath room, bathroom, toilet, lavatory, powder room, john, jakes, necessary, loo, men's room, ladies' room, rest room, (uncleanness), 653 attic, loft, garret, cockloft, clerestory, cellar, vault, hold, cockpit, cubbyhole, cook house, entre-sol, mezzanine floor, ground floor, rez-de-chaussee, basement, kitchen, pantry, bawarchi-khana, scullery, offices, storeroom, lumber room, dairy, laundry, coach house, garage, hangar, outhouse, penthouse, lean-to, portico, porch, stoop, stope, veranda, patio, lanai, terrace, deck, lobby, court, courtyard, hall, vestibule, corridor, passage, breezeway, ante room, ante chamber, lounge, piazza, veranda, conservatory, greenhouse, bower, arbor, summerhouse, alcove, grotto, hermitage, lodging, bed, carriage, capsular, saccular, sacculated, recipient, ventricular, cystic, vascular, vesicular, cellular, camerated, locular, multilocular, polygastric, marsupial, siliquose, siliquous.

artery of the vestibule bulb, fenestra of the vestibule, vestibule of the ear, vestibule of the vagina