名詞 fundament:

1. the fundamental assumptions from which something is begun or developed or calculated or explained
   同義詞：basis, base, foundation, groundwork, cornerstone
2. the fleshy part of the human body that you sit on
   同義詞：buttocks, nates, arse, butt, backside, bum, buns, can, hindquarters, hind end, keister, posterior, prat, rear, rear end, rump, stern, seat, tail, tail end, tooshie, tush, bottom, behind, derriere, fanny, ass
3. lowest support of a structure
   同義詞：foundation, base, foot, groundwork, substructure, understructure

fun.da.ment

n.（名詞）

The buttocks.
臀部
The anus.
肛門
The natural features of a land surface unaltered by human beings.
未受人類改變的自然地貌
A foundation, as of a building.
基礎：如建筑物的基礎
An underlying theoretical basis or principle:
基本原則或原理：
例句：
.All neighbor states . . . must revise . . . their policy fundaments.(C.L. Sulzberger)
.所有鄰國…必須重新確定他們的政治原則.(C.L.蘇茲貝格)

來源：
Middle English foundement
中古英語 foundement
from Old French fondement
源自 古法語 fondement
from Latin fund3mentum
源自 拉丁語 fund3mentum
from fund3re [to lay the foundation]
源自 fund3re [打地基]
from fundus [bottom]
源自 fundus [底部]