Final answer:
The feature that helps us recognize multi-syllable words as one word due to its rhythmic pattern is called lexical grouping, and is closely related to the concepts of rhythm and meter in poetry.
Step-by-step explanation:
When several syllables go together to make up a word, and we recognize it as one word due to its rhythmic pattern, this feature is called lexical grouping. In poetry and language, rhythm plays a crucial role, often established through patterns of stressed and unstressed syllables known as meter. An example of meter in action is found in nursery rhymes like "JACK and JILL went UP the HILL," where the rhythm is created by the emphasis placed on particular syllables. Understanding rhythm and the concept of lexical grouping enhances our appreciation of both poetry and the way we perceive language in everyday life.