beneficiala.[Cf. F. bnficial, LL. beneficialis.]1. Conferring benefits; useful; profitable; helpful; advantageous; serviceable; contributing to a valuable end; -- followed by to.()The war which would have been most beneficial to us. (Swift.)2. (Law) Receiving, or entitled to have or receive, advantage, use, or benefit; as, the beneficial owner of an estate.(Kent.)3. King.(B. Jonson.)()