Noun
first-year student; first-year pupil
わたしは去年一年生でした。I was a first year student last year. beginner; novice; newcomer; person who has been in a role for less than a year
Noun which may take the genitive case particle 'no'
annual
Botany
Noun
annual plant
BotanyAbbreviationsee 一年生植物
Also written 一年生【いちねんせい】