retentivity noun. [ri:tɛn'tɪvɪti] L19.
[formed as RETENTIVE adjective + -ITY.]
1. The ability of a substance to resist or (esp.) retain magnetization, freq. measured as the strength of the magnetic field that remains in a sample after removal of an inducing field. L19.

2. Psychology. (Degree of) retention in the memory. E20.

3. Geology. The property of a rock or mineral of retaining gases, esp. radiogenic ones. M20.

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