STRONGS G5066:
													
												
									    		τεταρταῖος, 
τεταρταια, 
τεταρταιον (
τέταρτος), an ordinal numeral, used in answer to the question on what day? 
one who does or suffers a thing till the fourth day or on the fourth day: 
τεταρταῖος ἐστιν, i. e. he has been four days in the tomb, or it is the fourth day since he was buried (
A. V. he hath been dead four days), 
John 11:39 (
ἤδη γάρ ἦσαν πεμπταιοι, already five days dead, 
Xenophon, an. 6, 4 (2), 9). 
    THAYER’S GREEK LEXICON, Electronic Database.
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