仮(かり)にsupposing, even if, granting that, for argument's sake, temporarily, provisionally, for the time being

仮(かり)にあなただったら、どうしていましたか？

If it were you, what would you have done?

もし仮(かり)に、彼(かれ)が来(こ)なくても、私(わたし)は平気(へいき)です。

Even if he doesn't come, I'm fine.

仮(かり)に、明日(あした)が雨(あめ)でもかまわない。

Even if it rains tomorrow, I don't mind.

仮(かり)に、この世界(せかい)が人間(にんげん)ばかりではなく、マンモスや怪獣(かいじゅう)などの大(おお)きな動物(どうぶつ)も住(す)んでいたら、人間(にんげん)はどうなるかな？

What if, in this world, not only humans but also large animals like mammoths and monsters lived here? What would happen to humans?

もし仮(かり)に、私(わたし)が高校(こうこう)教師(きょうし)になったら、厳(きび)しい反面(はんめん)、自由時間(じゆうじかん)も多(おお)く与(あた)える、良(よ)い先生(せんせい)になりますよ。

If I were to become a high school teacher, I would be a good teacher who is strict but also gives a lot of free time.