ter·nate \ˈtərˌnāt, -_nə̇t\adjective Etymology: New Latin ternatus, from Medieval Latin, past participle of ternare to treble, from Latin terni three each — more at tern 1.: arranged in threes < ternate leaves > 2.: composed of three leaflets or subdivisions < a compound ternate leaf > • ter·nate·lyadverb