In a dominant manner; with supreme or controlling influence.
From 'dominant' (Latin 'dominans') + '-ly' (adverbial suffix forming adverbs from adjectives). A straightforward formation creating an adverbial form of the adjective.
In genetics, 'dominantly' describes traits that show up even when inherited from just one parent—a dominantly inherited gene only needs one copy to express itself, which is why dominant traits spread through populations faster than recessive ones.
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