valid

/ˈva-ləd/

borrowed from Middle French or Latin; Middle French valide "in good health, having legal force," borrowed from Latin validus "in good health, robust, potent, having legal authority," adjective derivative from the base of valēre "to have strength, be well"

adjective

  1. having legal efficacy or force; especially : executed with the proper legal authority and formalities

  2. well-grounded or justifiable : being at once relevant and meaningful

  3. logically correct

valid sound cogent convincing telling mean having such force as to compel serious attention and usually acceptance. valid implies being supported by objective truth or generally accepted authority. sound implies a basis of flawless reasoning or of solid grounds.