Meaning

noun the defensive football players who line up behind the linemen

noun coil such that current is induced in it by passing a current through the primary coil

adjective being of second rank or importance or value; not direct or immediate

originFrom Middle English secundarie, from Latin secundārius (“of the second class or quality”), from secundus (whence the English second) + -ārius (whence the English suffix -ary), equivalent to second + -ary; compare the French secondaire, the Italian secondario, the Occitan secundari, the Portuguese secundario, and the Spanish secundario.

Etymology from Wiktionary, CC BY-SA 3.0