[eli.sion] n [LL elision-, elisio, fr. L elidere] (1581) 1 a: the use of a speech form that lacks a final or initial sound which a variant speech form has (as 's instead of is in there's) b: the omission of an unstressed vowel or syllable in a verse to achieve a uniform metrical pattern
2: the act or an instance of omitting something: omission