Etymology
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aptness (n.)

1530s, from apt + -ness.

Entries linking to aptness

apt (adj.)
mid-14c., "inclined, disposed;" late 14c., "suited, fitted, adapted, possessing the necessary qualities for the purpose," from Old French ate "fitting, suitable, appropriate" (13c., Modern French apte), or directly from Latin aptus "fit, suited, proper, appropriate," adjectival use of past participle of *apere "to attach, join, tie to," from PIE root *ap- (1) "to grasp, take, reach" (source also of Sanskrit apnoti "he reaches," Latin apisci "to reach after, attain," Hittite epmi "I seize"). Elliptical sense of "becoming, appropriate" is from 1560s.
-ness 

word-forming element denoting action, quality, or state, attached to an adjective or past participle to form an abstract noun, from Old English -nes(s), from Proto-Germanic *in-assu- (cognates: Old Saxon -nissi, Middle Dutch -nisse, Dutch -nis, Old High German -nissa, German -nis, Gothic -inassus), from *-in-, originally belonging to the noun stem, + *-assu-, abstract noun suffix, probably from the same root as Latin -tudo (see -tude).

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Definitions of aptness

aptness (n.)
a disposition to behave in a certain way;
the aptness of iron to rust
Synonyms: propensity
aptness (n.)
appropriateness for the occasion;
the phrase had considerable aptness
Synonyms: appositeness
From wordnet.princeton.edu

Dictionary entries near aptness

apt

apterous

apteryx

aptitude

aptly

aptness

aqua-

aqua

aqua fortis

aqua vitae

aquacade

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