N2
ぶりに
For the first time in, Haven't done for some time
一年ぶりに五キロも走ったから明日は絶対に筋肉痛だ。
I am definitely going to be sore tomorrow because I ran a 5K for the first time in a year.
Explanation
Follows a length of time (「3年、1か月、半年」, 「久し」) and means 'for the first time in ...'. A long gap lay between the last time and this time, often with a feeling of reunion: 「10年ぶりに再会した」 (We met again after ten years). Before a noun use 「ぶりの」; at the end of a sentence 「ぶりです」.
Mixed up with
「ぶりに」: how long it has been since the last time. 「3年ぶりに会った」 (I met them for the first time in three years).
「おきに」: skipping a unit. 「1日おきに」 (every other day), 「1メートルおきに」 (every other metre).
「ごとに」: every single one counts. 「10分ごとに」 (every 10 minutes), 「会う人ごとに挨拶する」 (greet everyone I meet).