valid
adj.
1570s, "having force in law, legally binding," from Middle French valide (16c.), from Latin validus "strong, effective, powerful, active," from valere "be strong" (see valiant). The meaning "sufficiently supported by facts or authority, well-grounded" is first recorded 1640s.
〔李〕[val;-ida.] a.有效的； 正当的； 正确的 ←val,vail (L valere,valitum)=to be worth or strong 价值，强壮