Syllable division and stress derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
grade-appropriate is an adjective meaning "the quality of ability and work that is appropriate for students in a specified grade". It carries one recorded sense.
the quality of ability and work that is appropriate for students in a specified grade
Definitions, synonyms and semantic relations for grade-appropriate come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.