I. noun
1.
the under surface as opposed to the top surface
gum was stuck to the bottom of her shoe
Synonyms: sole, underneath, underside, undersurface
Related Word: belly, underbelly, underbody; base, floor, foot, ground
Contrasted words: acme, apex, cap, crest, crown, tip, upper
Antonyms: top
2.
Synonyms: buttocks , *ass, backside, behind, breech, derriere, fanny, heinie ( or hiney), posterior, rear end
3.
the lower or lowest point
the bottom of the page
Synonyms: base, foot, nadir
Related Word: basement, floor, ground; end; low
Contrasted words: acme, apex, pinnacle, zenith
Antonyms: top
4.
Synonyms: base 1, basement, bed, bedrock, footing, foundation, ground, rest, seat, substructure
5.
Synonyms: essence 2, essentiality, marrow, pith, quintessence, quintessential, soul, stuff, substance, virtuality
II. verb
Synonyms: base , establish, found, ground, predicate, rest, stay
III. adjective
1.
Synonyms: bottommost , lowermost, lowest, nethermost, rock-bottom, undermost
2.
Synonyms: fundamental 1, basal, basic, foundational, meat-and-potatoes, primary, radical, underlying