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Secondary amenorrhea is defined as the absence of menstruation for a period of time in a woman who has previously had at least one regular menstrual cycle. The correct identification of this condition centers on the time frame during which menstruation has ceased after already being established. In this case, no menstrual periods for six months in a female who has had normal menstruation beforehand is a clear indicator of secondary amenorrhea.

This time frame of six months is significant, as it meets the clinical criteria used to define the condition. It illustrates a change from a pattern of normal menstruation to a complete cessation, prompting further investigation into underlying causes such as hormonal imbalances, stress, lifestyle changes, or medical conditions.

The other options do not fit the definition of secondary amenorrhea. A complete absence of menstruation since puberty relates to primary amenorrhea. The lack of menses for three consecutive cycles, while concerning, does not meet the six-month duration required for a diagnosis of secondary amenorrhea. Lastly, increasingly irregular menstrual cycles may indicate other menstrual disorders but do not signify secondary amenorrhea on their own. Thus, the context and timing in option A provide the correct understanding of secondary amenorrhea.