Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
third-year is an adjective meaning "used of the third or next to final year in United States high school or college". It carries one recorded sense.
used of the third or next to final year in United States high school or college
“the junior class”
“a third-year student”
Definitions, synonyms and semantic relations for third-year come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.