1.  parterre(n = noun.artifact) - an ornamental flower garden; beds and paths are arranged to form a pattern;
is a kind of flower garden

2.  parterre(n = noun.artifact) parquet circle - seating at the rear of the main floor (beneath the balconies);
is a kind of seating, seating area, seating room, seats
is a part of house, theater, theatre

1.  An ornamental and diversified arrangement of beds or plots, in which flowers are cultivated, with intervening spaces of gravel or turf for walking on. [1913 Webster]

2.  The pit of a theater; the parquet. [1913 Webster]

parterre, n.
1 a level space in a garden occupied by flower-beds arranged formally.
2 US the ground floor of a theatre auditorium, esp. the pit overhung by balconies.

Etymology:
F, = par terre on the ground

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.

N  agriculture, cultivation, husbandry, farming, georgics, geoponics, tillage, agronomy, gardening, spade husbandry, vintage, horticulture, arboriculture, floriculture, landscape gardening, viticulture, husbandman, horticulturist, gardener, florist, agricultor, agriculturist, yeoman, farmer, cultivator, tiller of the soil, woodcutter, backwoodsman, granger, habitat, vigneron, viticulturist, Triptolemus, field, meadow, garden, botanic garden, winter garden, ornamental garden, flower garden, kitchen garden, market garden, hop garden, nursery, green house, hot house, conservatory, bed, border, seed plot, grassplot, grassplat, lawn, park, parterre, shrubbery, plantation, avenue, arboretum, pinery, pinetum, orchard, vineyard, vinery, orangery, farm, agricultural, agrarian, agrestic, arable, predial, rural, rustic, country, horticultural.