Fortieth

For"ti*eth (?), a. [AS. feowertigoa. See Forty.]

1.

Following the thirty-ninth, or preceded by thirty-nine units, things, or parts.

2.

Constituting one of forty equal parts into which anything is divided.

© Webster 1913.

For"ti*eth, 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.

© Webster 1913.