Quick Definition
Pentecost
Strong's Definition
fiftieth (G2250 (ἡμέρα) being implied) from Passover, i.e. the festival of "Pentecost"
Derivation: feminine of the ordinal of G4004 (πεντήκοντα);
KJV Usage: Pentecost
Thayer's Greek Lexicon
πεντηκοστή, πεντηκοστῆς, ἡ (namely, ἡμέρα; feminine of πεντηκοστός fiftieth) (from Plato down.), Pentecost (properly, the fiftieth day after the Passover, Tob_2:1; 2Ma_12:32; (Philo de septen. § 21; de decal. § 30; cf. Winer's Grammar, 26)), the second of the three great Jewish festivals; celebrated at Jerusalem yearly, the seventh week after the Passover, in grateful recognition of the completed harvest (Exo_23:16; Lev_23:15; Deu_16:9): Act_2:1; Act_20:16; 1Co_16:8 (Josephus, Antiquities 3, 10, 6; (14, 13, 4; etc.)). (BB. DD. (especially Ginsburg in Alex.'s Kitto) under the word ; Hamburger, Real-Encycl. 1, under the word, Wochenfest; Edersheim, The Temple, chapter xiii.)
Mounce Concise Greek Dictionary
πεντηκοστή pentēkostē 3x
Pentecost, or the Feast of Weeks; one of the three great Jewish festivals, so called because it was celebrated on the fiftieth day, reckoning from the second day of the feast of unleavened bread, i.e., from the 16th day of Nisan, Act_2:1 ; Act_20:16 ; 1Co_16:8 * Pentecost.
Abbott-Smith Greek Lexicon
πεντηκοστός , -ή , -όν ,
[in LXX for H2549 , Lev_25:10-11 , 2Ki_15:23 ; 2Ki_15:27 ; 1Ma_4:1-61 , 2Ma_14:4 ; ἡ Papyri, Tob_2:1 , 2Ma_12:32 * ;]
fiftieth. As subst ., ἡ Papyri;
(a) ( sc . μερίς ), at Athens, a tax of two per cent.;
(b) ( sc . ἡμέρα , i.e . the fiftieth day after the Passover), Pentecost , the second of the three great Jewish feasts (To, 2Mac, ll . c .; ἑορτὴ ἑβδομάδων , Deu_16:10 , al. ) : Act_2:1 ; Act_20:16 , 1Co_16:8 .†
πεντηκοστή , -ῆς , ἡ , see πεντηκοστός .
Moulton & Milligan — Vocabulary of the Greek NT
πεντηκοστή [page 503]
With the use of this word to denote the Jewish Feast of Pentecost we are not at present concerned. It may be noted, however, that in the ostraca πεντηκοστή is a 2% tax : see Wilcken Ostr. i. pp. 276 ff., 343 f., and the note ad OGIS 46 .12 (B.C. 285 247) τοὺς ὑποτεθέντας εἰς τὰς εἰκόνας , τὴν πεντηκόστην καὶ τὸ γραφίον τῶν ὅρκων .
STEPBible — Tyndale Abridged Greek Lexicon
πεντηκοστός, -ή, -όν
[in LXX for חֲמִישִׁי, חֲמִישִׁי, Lev.25:10-11, 4Ki.15:23 15:27; 1Ma.4:1-61, 2Ma.14:4; ἡ π., Tob.2:1, 2Ma.12:32 * ;]
fiftieth. As subst., ἡ π.;
__(a) (sc. μερίς), at Athens, a tax of two per cent.;
__(b) (sc. ἡμέρα, i.e. the fiftieth day after the Passover), Pentecost, the second of the three great Jewish feasts (To, 2Mac, ll. with; ἑορτὴ ἑβδομάδων, Deu.16:10, al.) : Act.2:1 20:16, 1Co.16:8.†
(AS)