Main Entry:

¹in·val·id

Pronunciation:

\(ˌ)in-ˈva-ləd\

Function:

adjective

Etymology:

Latin invalidus weak, from in- + validus strong — more at valid

Date:

1542

: not valid: a: being without foundation or force in fact, truth, or law <an invalid assumption> <declared the will invalid> b: logically inconsequent

— in·val·id·ly \-lē\ adverb