"maverick" in the noun sense
1. maverick, rebel
someone who exhibits great independence in thought and action
2. maverick
an unbranded range animal (especially a stray calf belongs to the first person who puts a brand on it
"maverick" in the adjective sense
1. irregular, maverick, unorthodox
independent in behavior or thought
"she led a somewhat irregular private life"
"maverick politicians"
Source: WordNet® (An amazing lexical database of English)
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