Apocope
By Apocope (Greek “ἀποκοπή”, ‘cutting off’) is denoted the loss of a final vowel before a word beginning with a consonant. No apostrophe marks the omission. The chief Homeric instances are “ἄν, κάτ, πάρ”, and “ἄρ” (for “ἀνά, κατά, παρά”, and “ἄρα”). E. g. A 143, “ἄν”. A 8, “ἄρ”.