Eight·i·eth a.
1. The next in order after seventy-ninth.
2. Consisting of one of eighty equal parts or divisions.
Eight·i·eth, n. The quotient of a unit divided by eighty; one of eighty equal parts.
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eightieth
adj : the ordinal number of eighty in counting order [syn: 80th]
n : position 80 in a countable series of things