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: asserting oneself or one's own rights, claims, or opinions
: self-assured, confident
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arrogant, bumptious, cavalier, chesty, haughty, high-and-mighty, high-handed, high-hat, highfalutin (also hifalutin), huffish, huffy, imperious, important, lofty, lordly, masterful, overweening, peremptory, pompous, presuming, presumptuous, pretentious, self-assertive, sniffy, supercilious, superior, uppish, uppity
humble, lowly, modest, unarrogant, unpretentious
1821, in the meaning defined at sense 1
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occurring twice a year or every two years
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