the connection of two phrases so that the cadence of one overlaps with the beginning of another.
Lat. "knocking out." The practice of omitting certain syllables during scansion. A final syllable ending in a vowel (or the letter -m) is normally elided before a word beginning with a vowel (or an h-).
Elision makes two syllables occupy a single metrical position. Normally elision happens "where there is an unstressed vowel before a consonant or where one syllable ends with a vowel and the next begins with one ('the other')" (Poetry in English 1166). See Example 20.