valeo

Valeo, valere, valui, valiturus is second conjugation and deceptively broad. Physically it is to be strong or in good health. With an infinitive it does the work of possum, "be able". With ad or adversus it is "be effective against". Of words and coins it is "be worth, mean", which is where the grammarians' valet, "it means", comes from.

The imperative vale is simply goodbye, literally "keep well", with valete for a group: the standard sign-off of a Roman letter. The family is large and productive - valor, value, valid, invalid, prevail, avail, convalescent - and in the Vulgate valeat often reads as a plain jussive, "let it stand good", not a wish.