0 an idea of what something or someone is like, or a basic understanding of a situation or a principle:
1 the process of a male and a female sex cell joining and causing a baby to start to form:
at/from the moment of conception
2 an idea or a particular way you understand or think about something, or a basic understanding of a situation or principle:
3 the process in which a baby starts to form in the uterus from the coming together of a sperm and an egg