The fifth letter of the Hebrew alphabet, a very light colorless element that is one of the six inert gasses; the most difficult gas to liquefy; occurs in economically extractable amounts in certain natural gases (as those found in Texas and Kansas), the 5th letter of the Hebrew alphabet, pro Any one; the man or person; -- used indefinitely, and usually followed by a relative pronoun, Man; a male; any male person; -- in this sense used substantively