cycles Definition

an interval of time during which a sequence of a recurring succession of events or phenomena is completed

a course or series of events or operations that recur regularly and usually lead back to the starting point

one complete performance of a vibration, electric oscillation, current alternation, or other periodic process

to pass through a cycle

to recur in cycles

to ride a cycle; specifically : bicycle

a cycle of economic activity usually consisting of recession, recovery, growth, and decline

the cycle of enzyme-catalyzed dark reactions of photosynthesis that occurs in the chloroplasts of plants and in many bacteria and that involves the fixation of carbon dioxide and the formation of a 6-carbon sugar

the cycle of carbon in the earth's ecosystems in which carbon dioxide is fixed by photosynthetic organisms to form organic nutrients and is ultimately restored to the inorganic state (as by respiration, protoplasmic decay, or combustion)

a cycle of thermonuclear reactions in which four hydrogen atoms synthesize into a helium atom by the catalytic action of carbon with the release of nuclear energy and which is held to be the source of most of the energy radiated by the sun and stars

the complete series of events from one cell division to the next

krebs cycle

the correlated phenomena of the endocrine and reproductive systems of a female mammal from the beginning of one period of estrus to the beginning of the next —called also estral cycle, estrus cycle

the sequence of conditions through which water passes from vapor in the atmosphere through precipitation upon land or water surfaces and ultimately back into the atmosphere as a result of evaporation and transpiration —called also hydrological cycle

the series of stages in form and functional activity through which an organism passes between successive recurrences of a specified primary stage

life history

a series of stages through which something (such as an individual, culture, or manufactured product) passes during its lifetime