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An annual cycle refers to a set of changes or events that uniformly, or consistently, take place at the same time of year.
In biology, the annual cycle for plants and animals details behavioral and chemical changes that take place as the seasons advance.
In business, a business cycle refers to the way modelling and analysis is applied to the periodic development and marketing of new products and services.
In religion, the annual cycle refers to the various celebrations or memorials that occur in the same sequence from year to year. For example, in Christianity the liturgical year is an annual cycle, which for some Christian denominations is composed of the temporal cycle that tracks the events in the life of Christ, and the sanctoral cycle which tracks the various saint's days. Some Christian churches only observe the temporal cycle.