apt

Etymology 1

From Old French apte, from Latin aptus, from obsolete apere (“to fasten, to join, to fit”), akin to apisci (“to reach, attain”); compare with Greek ἅπτειν (ἅptein, “to fasten”) and Sanskrit आप्त (āpta, “fit”), from आप् (āp, “to reach, attain”).

adj

1. Suitable; appropriate; fit or fitted; suited.
   an apt metaphor
   apt punishment
2. (of persons or things) Having a habitual tendency; habitually liable or likely; disposed towards.
   This tree, if unprotected, is apt to be stripped of its leaves by a leaf-cutting ant. 1874, John Lubbock, Scientific Lectures / On Plants and Insects
   that lofty pity with which prosperous folk are apt to remember their grandfathers 1886, Frederic Harrison, The Choice of Books
3. Ready; especially fitted or qualified (to do something); quick to learn.
   a pupil apt to learn
   an apt scholar

Etymology 2

# Abbreviation of apartment.

noun

1. An apartment; a flat.
   Where our apt used to be they built a fancy condominium high-rise. Which at a lowly income none of us could ever really quite afford. 2010, David Dondero, Just a Baby in Your Momma's Eyes