fortieth/ˈfɔː.ti.əθ/EtymologyFrom earlier fourteth, from Middle English fourtithe, fourtiþe; equivalent to forty + -eth. For the modern form, see the etymological notes at twentieth.fortieth means The ordinal form of the number forty. Lexicurio rates it Rare gem — a strength score of 77 out of 100.adjThe ordinal form of the number forty.nounThe person or thing in the fortieth position.One of forty equal parts of a whole.