noun
first-year student; first-year pupil
Used for students in their first year at school or university. Common in educational contexts.
彼は大学の一年生です。
He is a first-year university student.
一年生の教室は一階にあります。
The first-year classroom is on the first floor.
noun
Figurative extension: someone new to a role, job, or activity, often implying inexperience. Can be used humorously or self-deprecatingly.
まだ入社一年生なので、わからないことばかりです。
I'm still a newcomer at the company, so there's a lot I don't know.
料理一年生の私でも作れる簡単なレシピです。
It's a simple recipe that even a cooking novice like me can make.
noun which may take the genitive case particle 'no'
Botanical term. Sense 4 is an abbreviation of 一年生植物 (annual plant). Used attributively with の or in compounds.
一年生の植物は一年で枯れます。
Annual plants die within one year.
この花壇には一年生の花を植えました。
I planted annual flowers in this flower bed.