1. Adverb (fukushi), Suru verb

   for a moment; for a minute

   Usually written using kana alone

   あなたは働きすぎです。しばらく座って楽にしなさい。

2. Adverb (fukushi)

   for a while; for some time

   Usually written using kana alone

3. for the time being; for now

   Usually written using kana alone

4. Interjection (kandoushi)

   it's been a long time; long time no see

   Usually written using kana alone

Also written 暫らく【しばらく】shibaraku、姑く【しばらく】shibaraku、須臾【しばらく】shibaraku