active

/ˈak-tiv/

Middle English, borrowed from Anglo-French & Latin; Anglo-French, borrowed from Latin āctīvus, from āctus (past participle of agere "to drive (cattle), cause to move, do") + -īvus -ive

adjective

  1. characterized by action rather than by contemplation or speculation

  2. producing or involving action or movement

  3. asserting that the person or thing represented by the grammatical subject performs the action represented by the verb

an active life

noun

  1. an active person : one engaged in an action or activity

fraternity alumni and actives

noun

  1. usually long-lasting immunity that is acquired through production of antibodies within the organism in response to the presence of antigens