adverb, noun which may take the genitive case particle 'no'
for a while; for a short time; soon
Literary or formal adverb meaning 'for a little while' or 'soon'. Often used in written language or polite speech; in casual conversation しばらく is more common.
しばしお待ちください。
Please wait a moment.
しばしの別れを惜しんだ。
We lamented our brief parting.
しばらく is the common word for 'a while' in everyday speech; しばし is more formal and literary.
The origin is uncertain; it is a native Japanese adverb.