пе́рвый

Preceding all others of a series or kind; the ordinal of one; earliest

• It's not the first time.

  Это не в первый раз.

  Tatoeba · Hybrid · CC BY 2.0 FR

• It's my first time here.

  Я здесь впервые.

  Tatoeba · CK · CC BY 2.0 FR

пе́рвый

Most eminent or exalted; most excellent; chief; highest

пе́рвый

Of or belonging to a first familyредкое

пе́рвый

Coming right after the zeroth in things that use zero-based numberingредкое

Before anything else; firstly

• Better if you go first.

  Иди лучше ты первый.

  Tatoeba · frpzzd · CC BY 2.0 FR

• I thought so at first.

  Я так и думал поначалу.

  Tatoeba · Hybrid · CC BY 2.0 FR

For the first time