(Originally simply) an event in a person's life; (now usually) specifically a significant event that causes a major change in a person's life, such as marriage, the birth of a child, etc.
Origin
Mid 19th century.
Definition of life event in US English:
life event
noun
(Originally simply) an event in a person's life; (now usually) specifically a significant event that causes a major change in a person's life, such as marriage, the birth of a child, etc.