Etymology: (1525–35; < L, comp. of posterus coming after, der. of post after)
Definition of 'posterior'
Princeton's WordNet
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 "he deserves a good kick in the butt"; "are you going to sit on your fanny and do nothing?"
2. (adj)back tooth, posterior a tooth situated at the back of the mouth
3. (adj)posterior located at or near or behind a part or near the end of a structure
4. (adj)later(a), ulterior, posterior coming at a subsequent time or stage "without ulterior argument"; "the mood posterior to"
Definition of 'posterior'
Webster Dictionary
1. (adj)posterior later in time; hence, later in the order of proceeding or moving; coming after; -- opposed to prior
2. (adj)posterior situated behind; hinder; -- opposed to anterior
3. (adj)posterior at or toward the caudal extremity; caudal; -- in humananatomy often used for dorsal
4. (adj)posterior on the side next the axis of inflorescence; -- said of an axillary flower