valid
VAL-idadjMeaning logically correct or well grounded; also, officially accepted
Memory hook VAL + ID: Val’s ID is accepted. At the gate, Val shows her ID; it is real and up to date, so the guard waves her through. Her ID is valid.
Your library card is valid for one more year.
In context The argument is valid, since its conclusion follows from its premises, but it is still wrong, because one of those premises is false.
Similar logical, well-founded, legitimate, reasonable
Opposite invalid, unsound, void
From Latin validus, “strong,” from valere (to be strong).