a. (sb.) Forms: 1–2 fiftigoða, -geða, fifteogoða, -gaðe, 2–3 fiftuða, -ðe, 3 fiftugeðe, 4–6 fif-, fyftith(e, -tyth(e, 6– fiftieth. [OE. fíftigoða:—earlier *fíftigunþa, corresponding to ON. fimmtugánde (Sw., Norw. femtiande, Da. femtiende), f. FIFTY on the analogy of TENTH.
In the other Teut. langs. the ordinal suffix is different: OFris. fîftichsta (Du. vijftigste), OHG. fimfzugôsto (MHG. vünfzegeste, mod.Ger. fünfzigste.]
The ordinal numeral belonging to the cardinal fifty. Fiftieth part: one of fifty equal parts into which a quantity may be divided.
c. 1000. Ælfric, Gram. (Z.), 283. Quinquagesimus, se fifteogoða.
c. 1175. Lamb. Hom., 87. Þe fiftuða dei fram þan estertid.
c. 1200. Trin. Coll. Hom., 117. Þe fiftugeðe dai after estrene dai.
1382. Wyclif, Num. viii. 25. Whanne the fyftithe ȝeer of age thei han fulfillid.
1530. Palsgr., 372. Cinquantiesme … fyftyth.
1579. Fulke, Heskins’ Parl., 495. The fiftieth Chapter sheweth the vnderstanding of the same text by Effrem & Primasius.
1611. Bible, Lev. xxv. 11. A Iubile shall that fiftieth yeere be vnto you.
1711. Newton, Opticks, III. xxi. (ed. 3), 325. Rarer there than at the fiftieth part of an Inch from its Body.
1868. Lockyer, Heavens (ed. 3), 310. The fiftieth part of a second of arc.
1800. Young, in Phil. Trans., XCI. 48. Their difference was exactly one-fifth of an inch. To this we must add a fiftieth.
