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office; official
chief; head
person (usually a woman) who officiates at religious ceremonies (on the Yaeyama Islands in Okinawa)
「首」 has other readings with different meanings.
選挙で国の首がようやく決まった。
The leader of the nation was decided.
彼は長年この村の首でありました。
He was the head of the village.
村の首が住民の声を聞いた。
The village chief listened to the residents' voices.