WordReference Random House Learner's Dictionary of American English © 2019
apt /æpt/USA pronunciation   adj. 
  1. likely;
    having a tendency:[be + ~ + to + verb]It's apt to be cold in the evenings.
  2. being quick to learn;
    bright: a very apt pupil.
  3. suited to the purpose or occasion;
    suitable: an apt metaphor.
apt•ly, adv. 
apt•ness, n. [uncountable]See -apt-.

apt.,  an abbreviation of:
  1. apartment.

-apt-, root. 
  1. -apt- comes from Latin, where it has the meaning "fit, proper.'' This meaning is found in such words as: adapt, apt, aptitude, inept.

WordReference Random House Unabridged Dictionary of American English © 2019
apt  (apt),USA pronunciation adj. 
  1. inclined;
    prone:too apt to slander others.
  2. likely:Am I apt to find him at home?
  3. unusually intelligent;
    able to learn quickly and easily:an apt pupil.
  4. suited to the purpose or occasion;
    appropriate:an apt metaphor; a few apt remarks on world peace.
  5. [Archaic.]prepared;
aptly, adv. 
aptness, n. 
  • Latin aptus fastened, fitted, fitting, appropriate, equivalent. to ap- fasten, attach + -tus past participle suffix
  • Anglo-French)
  • Middle English ( 1350–1400
    • 1.See corresponding entry in Unabridged liable.
    • 2.See corresponding entry in Unabridged See  likely. 
    • 3.See corresponding entry in Unabridged clever, bright;
      handy, adroit, dexterous, skillful.
    • 4.See corresponding entry in Unabridged fitting, meet, germane, felicitous.
      Apt, pertinent, relevant all refer to something suitable or fitting.
      Apt means to the point and particularly appropriate:an apt comment.Pertinent means pertaining to the matter in hand:a pertinent remark.Relevant means directly related to and important to the subject:a relevant opinion.
    Some usage guides insist that apt followed by an infinitive can or should be used to mean only "inclined, disposed'':He is apt to ignore matters he regards as unimportant.In fact, apt is standard in all varieties of speech and writing as a synonym for likely in contexts that suggest probability without any implication of a natural disposition toward:Hostilities are apt to break out if the confrontation is not soon resolved. She is apt to arrive almost any time now.See also  liable. 

apt., pl.  apts. 
  1. apartment.

Collins Concise English Dictionary © HarperCollins Publishers::

apt /æpt/ adj
  1. suitable for the circumstance or purpose; appropriate
  2. (postpositive; followed by an infinitive) having a tendency (to behave as specified)
  3. having the ability to learn and understand easily; clever (esp in the phrase an apt pupil)
Etymology: 14th Century: from Latin aptus fitting, suitable, from apere to fasten

ˈaptly adv ˈaptness n

'apt' also found in these entries:

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