

He's a senior, so he graduates this year.
[ˈhiz ə ˈsinjər, ˈsoʊ hi ˈɡrædʒəˌweɪts ˈðɪs ˈjɪr.]
The seniors are planning a trip after graduation.
[ðə ˈsinjərz ər ˈplænɪŋ ə ˈtrɪp ˈæftər ˌɡrædʒəˈweɪʃən.]
Is your brother a senior at this school?
[ˈɪz jər ˈbrəðər ə ˈsinjər ət ˈðɪs ˈskul?]
"senior" is in the lesson "Education" (Level 35), along with 10 other useful words. LinDuo has 180 topic lessons like this one, 2,375 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.