Nine·ti·eth a.
1. Next in order after the eighty-ninth.
2. Constituting or being one of ninety equal parts.
Nine·ti·eth, n.
1. The quotient of a unit divided by ninety; one of ninety equal parts of anything.
2. The next in order after the eighty-ninth.
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ninetieth
adj : the ordinal number of ninety in counting order [syn: 90th]
n : position 90 in a countable series of things