A timeframe is a single defined date range.
ie. Annual 2019 (Jan 1, 2019 - Dec 31, 2019), Q1 2019 (January 1, 2019 - March 31, 2019), January 2019

A cadence is a series of timeframes. It's recurring and defines the pace or frequency in which you are working to achieve your goals.
ie. Strategic (3-5 year), Annual, Quarterly, Monthly

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