1. (noun) buttocks, nates, arse, butt, backside, bum, buns, can, fundament, hindquarters, hind end, keister, posterior, prat, rear, rear end, rump, stern, seat, tail, tail end, tooshie, tush, bottom, behind, derriere, fanny, ass
the fleshy part of the human body that you sit on
Synonyms: screw, arse, keister, female genital organ, substructure, stinkpot, goat, cornerstone, stern, lavatory, git, croup, arsehole, butt, shadower, crapper, commode, throne, skunk, base, tooshie, foundation, butt end, lav, derriere, fuck, can buoy, shag, place, seat, prat, bottomland, fucking, hind end, behind, tin can, scum bag, asshole, freighter, understructure, ass, stub, backside, after part, female genitals, tramp, female genitalia, idler, nookie, toilet, piece of tail, laughingstock, shtup, poop, foot, screwing, posterior, potty, fag, bathroom, quarter, do-nothing, back end, dirty dog, tush, tail, merchantman, canful, can, croupe, butt joint, john, back tooth, bunghole, nates, rat, rump, nooky, pot, back, privy, underside, piece of ass, rear end, rear, layabout, bottom, buns, merchant ship, undersurface, tail assembly, hobo, loafer, fundament, stool, roll in the hay, empennage, rotter, so-and-so, stooge, target, stinker, buttocks, bottom of the inning, hindquarters, bum, cigaret, coffin nail, tin, crumb, groundwork, shadow, fag end, cigarette, bed, basis, tail end, fanny, lowlife, puke
Antonyms: prefrontal, antecedent, frontal, anterior
2. (adj) back tooth, posterior
a tooth situated at the back of the mouth
Synonyms: rear end, tush, tooshie, buns, derriere, fanny, bottom, backside, buttocks, seat, stern, hind end, tail, bum, prat, rear, can, behind, back tooth, hindquarters, ass, arse, posterior, rump, fundament, nates, butt, tail end, keister
Antonyms: anterior, antecedent, prefrontal, frontal
3. (adj) posterior
located at or near or behind a part or near the end of a structure
Synonyms: ulterior, later(a)
Antonyms: frontal, antecedent, prefrontal, anterior
4. (adj) later(a), ulterior, posterior
coming at a subsequent time or stage
Antonyms: frontal, anterior, prefrontal, antecedent
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Synonyms and Antonyms of posterior 
