The course of developmental changes in an organism from fertilized zygote to maturity when another zygote can be produced WordNet 3.0 & Open English WordNet

In biology, a biological life cycle is a series of stages of the life of an organism, that begins as a zygote, often in an egg, and concludes as an adult that reproduces, producing an offspring in the form of a new zygote which then itself goes through the same series of stages, the process repeating in a cyclic fashion. Wikipedia

The sequence of life stages that an organism undergoes from birth to reproduction ending with the production of the offspring Wikipedia Disambiguation

Period involving all different generations of a species succeeding each other through means of reproduction Wikidata

The phases, changes, or stages through which an organism passes throughout its lifetime. OmegaWiki