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The word pentecostes could not be parsed. Trying a normal dictionary lookup:
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† Pentēcostē, ēs, f., = πεντηκοστή (sc. ἡμέρα), the fiftieth day after Easter, WhitSunday, Pentecost (eccl. Lat.), Vulg. 2 Macc. 12, 32; id. 1 Cor. 16, 8; Tert. Idol. 14.