Meter & Rhythm
Pentameter
From Greek penta (five) + metron (measure). The Latin elegiac couplet alternates hexameter with pentameter; in English the pentameter stands alone.
Definition
A line of five metrical feet — in English, almost invariably iambic, forming the basis of the sonnet, blank verse, and heroic couplet.
Example
'Shall I comPARE thee TO a SUM-mer's DAY?' — five iambs.