Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
nonperiodic is an adjective meaning "not recurring at regular intervals". It carries one recorded sense.
not recurring at regular intervals
Definitions, synonyms and semantic relations for nonperiodic come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.