いつitsutsutsu
1.

A numeral representing the quantity that is five, used to indicate either countable items or age.

2.

A term denoting the age of five years, commonly used to refer to young children in that specific age range.

3.

A historical time reference used in ancient timekeeping, correlating to approximately eight o'clock in the morning or evening.

Example:

この箱にはリンゴが五つ入っている。

いつitsutsugo
1.

A group of five siblings born to the same mother at the same time, sharing the same genetic makeup and often experiencing similar developmental milestones.

2.

A unique familial arrangement in which five children are born together, presenting specific challenges and dynamics in parenting and family life.

3.

A rare occurrence in human births characterized by the simultaneous delivery of five offspring, which is celebrated in various cultures for its rarity and special significance.

4.

A term used to describe the collective identity and relationships among five individuals born during the same birthing event, highlighting their bond and shared experiences.