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Definition of basis : 1. The foundation of anything; that on which a thing rests.
2. The ground work the first or fundamental principle; that which supports.
3. The pedestal of a column, pillar, or statue.
4. The principal component part of a thing.

Synonyms:

prat, arse, undercoat, data, postulate, motivation, background, posterior, connect, solid ground, backside, home, nucleotide, stem, bedrock, irregularity, fundament, substructure, radical, hind end, nates, tooshie, evidence, creation, seat, element, tush, base, frequency, ass, butt, primer, can, backing, rear, buttocks, foundation garment, nucleus, burning issue/question, security, al-Qa'ida, dry land, way, means, alkali, base of operations, rudiment, nexus, reason, true, for the first/last etc. time, keystone, term, groundwork, rear end, proof, foot, tactic, justification, warrant, irregular, soil, instauration, tail end, key, warp, method, footing, authority, essence, behind, support, concern, terms, excuse, tail, mode, pedestal, land, underpinning, bottom, al-Qaida, fanny, floor, infrastructure, flat coat, priming coat, substratum, bag, earth, procedure, derriere, introduction, initiation, institution, fundamental, ground, priming, length, manner, founding, in justification of something, al-Qaeda, core, understructure, innovation, antecedent, buns, stand, radix, long, grounding, over, root word, primer coat, foothold, technique, staple, system, priority, time, pretext, cornerstone, stern, terra firma, keister, explanation, feature, much, rump, warp and woof, bed, hindquarters, foundation, rate, bum

enforcement, motivator, grounds, execution, action, inspiration, force, evocation, drive, determinant, root, origination, mainspring, stimulus, compulsion, effectuation, factor, elicitation, motive, source, provocation, compunction, cause, generation

issue, assertion, opinion, dissertation, essay, text, problem, premise, theme, argument, topic, axiom, contention, subject, concept, theorem, conjecture, paradigm, question, assumption, point, belief, principle, exposition, thesis, inference, matter, hypothesis, statement, idea, presumption, consideration, position, query, postulation, motif

event, condition, landmark, juncture, conjuncture, circumstance, moment, instant, occasion, occurrence, situation, status, episode, incidence, happening, cardinal point, milestone

Usage examples:

• Pull The young man who is expecting to get a fat job through pull is working on a false basis. - "Dollars and Sense", Col. Wm. C. Hunter.
• The basis is a peculiar sort of white silk. - "The Story of Malta", Maturin M. Ballou.
• If free men and slaves looked alike, what basis was there for treating them so differently? - "Public Opinion", Walter Lippmann.