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motility vs. mobility

motility
[moh-til-i-tee] / moʊˈtɪl ɪ ti /

noun

  1. Biology. the ability to move spontaneously, or the rate or degree of such movement.

    Advanced zinc deficiency can impair the motility and number of sperm.
mobility
[moh-bil-i-tee] / moʊˈbɪl ɪ ti /

noun

  1. the quality of being mobile.

  2. Sociology. social mobility.