Final answer:
A 'stressed syllable' is one that is pronounced with greater emphasis or force. In poetry, the combination of stressed and unstressed syllables forms the meter, which is the rhythm of a poem.
Step-by-step explanation:
The term 'a stressed syllable' refers to a syllable that is emphasized or given more force when pronounced. This contrast in loudness and duration distinguishes it from unstressed syllables within a word or phrase. The pattern of stressed and unstressed syllables forms the meter of a poem, contributing to its rhythmic structure. In metrical notation, a stressed syllable is marked with a "/" while an unstressed syllable is marked with an "x".
Meter is incredibly important in poetry as it adds a musical rhythm to the text; much like ancient poetry which often accompanied the beat of drums. Distinct meters, such as iambic pentameter, use variations in stressed and unstressed syllables to produce different effects and rhythms comparable to musical compositions.