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Definition of dominant : 1. Ruling; governing; prevailing; controlling; predominant; as, the dominant party, church, spirit, power.
2. The fifth tone of the scale; thus G is the dominant of C, A of D, and so on.

Synonyms:

rife, capital, plain, apparent, greatest, preponderant, grand, visible, numero uno, domineering, clone, carrier, dominative, number one, obvious, dominating, plethoric, possessive, retiring, manifest, key, preponderating, cross, prepotent, lordly, despotic, highest, predominate, central, noticeable, primary, arch, overmastering, overriding, aggressive, distinct, demonstrative, preeminent, reigning, cloning, cardinal, authoritative, powerful, assertive, cross-fertilization, autocratic, important, imperative, overabundant, big, chromosome, submissive, in charge, prior, regnant, cross-fertilize, bossy, main, great, principal, primal, masterful, dominant allele, ascendent, governing, over, imperious, first, overbearing, identifiable, prevalent, prevailing, deoxyribonucleic acid, perceptible, premier, strong, show up, carry

median, normal, middling, medium, average, midmost, mid, mediocre, everyday, customary, stereotype, run-of-the-mill, moderate, usual, commonplace, halfway, mezzo, mean, ordinary, stock, standard, conventional, common, middle-of-the-road

high-powered, formidable, influential

crowning, headmost, furthermost, maximum, consummate, champion, leading, choice, chief, signal, elite, controlling, best, most, sovereign, superior, eminent, master, A-1, foremost, above, predominant, paramount, quintessential, ruling, furthest, senior, chosen, uppermost, supreme, better, commanding, king, zenith, ascendant

major, meaningful, fundamental, crucial, serious, vital, significant

Usage examples:

• Yet suspicion is his dominant trait. - "Ways of Nature", John Burroughs.
• If she could only get her arms about his neck she could win and hold him, and, what was far more important, she could conquer herself, for great as she knew her love to be, she was fully aware of the hold her ambition had upon her and she dreaded lest that influence should become dominant in this hour. - "The Doctor A Tale Of The Rockies", Ralph Connor.
• In the case of a Government representing a dominant class, the same thing holds, though not so manifestly. - "Essays: Scientific, Political, & Speculative, Vol. I", Herbert Spencer.