means 'for the first time in (...)' whe put with acounter . Very rarely used in kanji form 振りに It is usually only used for longer duration of time (time > O(hours))
３年ぶりに風呂に入る。 I bathed for the first time in 3 years.
The very common 久しぶり is one specific case of this!
久し{{c1::ぶりに}}ですね。 It's been a while, hasn't it? (lit.) This is the first time in a while, isn't it?
に can become の if it directly modifies a noun.
４年ぶりの寿司だ！やっぱり日本の寿司はうまいな！ This is my this-4-year's first sushi!