[ val-id ]
/ ˈvæl ɪd /


sound; just; well-founded: a valid reason.
producing the desired result; effective: a valid antidote for gloom.
having force, weight, or cogency; authoritative.
legally sound, effective, or binding; having legal force: a valid contract.
Logic. (of an argument) so constructed that if the premises are jointly asserted, the conclusion cannot be denied without contradiction.
Archaic. robust; well; healthy.

Origin of valid

1565–75; < Latin validus strong, equivalent to val(ēre) to be strong + -idus -id4


Related forms

Can be confused

valet valid Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for non-valid

British Dictionary definitions for non-valid


/ (ˈvælɪd) /


having some foundation; based on truth
legally acceptablea valid licence
  1. having legal force; effective
  2. having legal authority; binding
having some force or cogencya valid point in a debate
logic (of an inference or argument) having premises and conclusion so related that whenever the former are true the latter must also be true, esp (formally valid) when the inference is justified by the form of the premises and conclusion alone. Thus Tom is a bachelor; therefore Tom is unmarried is valid but not formally so, while today is hot and dry; therefore today is hot is formally validCompare invalid 2 (def. 2)
archaic healthy or strong

Derived Forms

validly, adverbvalidity (vəˈlɪdɪtɪ) or validness, noun

Word Origin for valid

C16: from Latin validus robust, from valēre to be strong
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012