an expression of a general truth or principle, especially an aphoristic or sententious one: the maxims of La Rochefoucauld.
2.
a principle or rule of conduct.
Origin: 1400–50; late Middle English maxime ≪ Medieval Latin maxima (orig. in phrase maxima prōpositiō axiom, literally, greatest proposition), noun use of feminine of Latin maximus, superlative of magnus great; see much
"precept, principle," 1426, from M.Fr. maxime, from L.L. maxima, usually in maxima propositio "axiom," lit. "greatest premise," fem. of maximus "greatest" (see maximum).