Fortieth
From BiblePortal Wikipedia
Webster's Dictionary [1]
(1): ( a.) Following the thirty-ninth, or preceded by thirty-nine units, things, or parts.
(2): ( a.) Constituting one of forty equal parts into which anything is divided.
(3): ( n.) One of forty equal parts into which one whole is divided; the quotient of a unit divided by forty; one next in order after the thirty-ninth.
King James Dictionary [2]
For'Tieth, a. See Forty. The fourth tenth noting the number next after the thirty ninth.