An assonantal tercet is a three-line stanza unified not by end-rhyme but by the repetition of vowel sounds (assonance) across its lines, creating sonic cohesion through internal echoes; for example, lines containing “deep,” “sleep,” and “keep” share the long /iː/ sound; this technique offers flexibility in free verse while maintaining musicality, and is distinct from consonantal tercets (based on consonant repetition) or fully rhymed tercets.

An assonantal tercet uses repeated vowel sounds (assonance) rather than end-rhyme to unify its three lines; common in languages with fewer rhyming words or in free verse seeking sonic cohesion without strict rhyme; differs from consonantal tercets (consonance) and full-rhyme tercets; effective for creating musicality while maintaining flexibility; students should practice identifying internal vowel echoes (e.g., "deep," "sleep," "keep") and experiment with tercets in terza rima or standalone forms.