一いっ子し

noun

one child

Refers to a single child, often in contexts like family planning or counting children.

• 彼かれらは一いっ子しをもうける予よ定ていです。

  They plan to have one child.

noun

only child

Describes a person who has no siblings; the sole child of their parents.

• 彼かの女じょは一いっ子しなので、兄きょう弟だいがいません。

  She is an only child, so she has no siblings.

noun

one of several children; son and heir

Used when referring to one child among several, especially the eldest son who is the heir. Often appears in historical or formal contexts.

• 彼かれは三さん兄きょう弟だいの一いっ子しで、家いえを継つぐ立たち場ばにある。

  He is one of three sons and is in the position to inherit the family.

noun

one stone

Go (game) term: a single stone. Compare with 一目 (いちもく) for 'one eye' or 'one move'.

See also: 一目

• 碁ご盤ばんの上うえに一いっ子しを置おく。

  Place one stone on the Go board.