Wiktionary
n. (context fractional English) One of fifty-five equal parts of a whole. num. (context ordinal English) The ordinal form of the number fifty-five, describing a person or thing in position number 55 of a sequence.
WordNet
adj. the ordinal number of fifty-five in counting order [syn: 55th]
Usage examples of "fifty-fifth".
He passed his fifty-fifth birthday en route to Lanchow feeling that, in view of his relations with the War Department, his career henceforward held little promise.
I can recall of my own seeing at least a dozen instances where men of the Fifty-Fifth Georgia Killed prisoners under the pretense that they were across the Dead Line, when the victims were a yard or more from the Dead Line, and had not the remotest idea of going any nearer.
The compass needle slowly aligned to point hard to the east as I traveled south, and I wound up turning east on Fifty-fifth, toward the University of Chicago and Lake Michigan.