いい年をして[iitoshiwoshite] (in spite of) being old enough to know better
亥年[idoshi] year of the boar
一箇年[ikkanen] one year
一周年[isshuunen] one full year
一年以内に[ichineninaini] within a year

一年間[ichinenkan] (period of) one year
一年生[ichinensei] annual (plant)
一年草[ichinensou] annual (plant)
一年ぢゅう[ichinenjuu] all year round
一両年[ichiryounen] (a) year or two

一昨[issaku] one previous
一昨晩[issakuban] night before last
一昨夜[issakuya] night before last
昨今[sakkon] nowadays
昨春[sakushun] last spring

昨年[sakunen] last year
昨晩[sakuban] last night
昨夜[sakuya] evening
一昨々日[sakiototsui] two days before yesterday