capability; ability; innate or acquired capacity for something; talent

She has a special aptitude for mathematics.

readiness or quickness in learning; intelligence

He was placed in honors classes because of his general aptitude.

the state or quality of being apt; special fitness.

noun

disinclination , inaptitude , skillessness , incapacity , stupidity

noun

bent , disposition , drift , leaning , predilection , proclivity , proneness , propensity , tendencynotes:aptitude and attitude derive from latin aptitudo \'fitness , \' the first through french , the second through a french borrowing of italian attitudine , ability , capability , capacity , cleverness , competence , faculty , flair , gift , giftedness , intelligence , knack , proficiency , savvy , smarts , stuff * , talent , what it takesnotes:aptitude and attitude derive from latin aptitudo \'fitness , aptness , genius , head , instinct , turn , inclination