noun
first cousin once removed
Refers to the child of one's first cousin, or the first cousin of one's parent. A specific kinship term used in family contexts.
彼女は私のいとこ半にあたります。
She is my first cousin once removed.
いとこ半の結婚式に招待された。
I was invited to my first cousin once removed's wedding.
Compound of いとこ (cousin) and 半 (half), indicating a half-step generational difference. The exact historical derivation is uncertain, but the term is conventionally used for 'first cousin once removed'.