Adjective

(en-adj)

Suitable; appropriate; fit or fitted; suited.

Tonight there’s a full moon, which is apt , since the election night will bring out the lunatics.

* (Jeremy Taylor) (1613–1677)

a river apt to be forded by a lamb

(of persons or things) Having a habitual tendency; habitually liable or likely; disposed towards.

* (1628–1699)

My vines and peacheswere apt to have a soot or smuttiness upon their leaves and fruit.

* (1834-1913)

This tree, if unprotected, is apt to be stripped of its leaves by a leaf-cutting ant.

* (Fairfax Harrison) (1869-1938)

that lofty pity with which prosperous folk are apt to remember their grandfathers

Ready]]; especially fitted or [[qualify, qualified (to do something); quick to learn; prompt; expert; as, a pupil apt to learn; an apt scholar.

* (rfdate) Johnson

An apt wit.

* (rfdate) (William Shakespeare) (1564-1616)

*:(Although I) live a thousand years, I shall not find myself so apt to die.

Adjective

(en adjective)

Well grounded or justifiable, pertinent.

*{{quote-magazine, year=2012, month=March-April

, author=(Jan Sapp) , title=Race Finished , volume=100, issue=2, page=164 , magazine=(American Scientist) citation , passage=Few concepts are as emotionally charged as that of race. The word conjures up a mixture of associations—culture, ethnicity, genetics, subjugation, exclusion and persecution. But is the tragic history of efforts to define groups of people by race really a matter of the misuse of science, the abuse of a valid biological concept?}}

I will believe him as soon as he offers a valid answer.

Acceptable, proper or correct.

A valid format for the date is MM/DD/YY.

Do not drive without a valid license.

Related to the current topic, or presented within context, relevant.

(logic) Of a formula or system: such that it evaluates to true regardless of the input values.

(logic) Of an argument: whose conclusion is always true whenever its premises are true.

An argument is valid if and only if the set consisting of both (1) all of its premises and (2) the contradictory of its conclusion is inconsistent.