Definition of "nonperiodic" []

• Not periodic; lacking a regular cycle; irregular (adjective)

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• "In the 1880s, while studying the three-body problem, he found that there can be orbits which are nonperiodic, and yet not forever increasing nor approaching a fixed point."
• "Using a nonperiodic key alphabets, ATTACK AT TWO TODAY, becomes, with spaces suppressed:"
• "By activating the Analysis ToolPak add-in, you add over 30 specialized finan - cial functions that run the gamut from those that calculate the accrued interest for a security paying interest periodically and only at maturity, all the way to those that calculate the internal rate of return and the net pres - ent value for a schedule of nonperiodic cash flows."