[si-lek-tiv-i-tee, see-lek-]
the state or quality of being selective.
Electricity. the property of a circuit, instrument, or the like, by virtue of which it can distinguish oscillations of a particular frequency.
Radio. the ability of a receiving set to receive any one of a band of frequencies or waves to the exclusion of others.

1900–05; selective + -ity Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
selectivity (sɪˌlɛkˈtɪvɪtɪ)
1.  the state or quality of being selective
2.  the degree to which a radio receiver or other circuit can respond to and separate the frequency of a desired signal from other frequencies by tuning
3.  the principle that welfare services should go only to those whose need is greatest, as revealed by needs tests, means tests, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The colleges affected by the ban could change from year to year as their
  selectivity changes.
He also controlled for differences in the selectivity of the colleges.
Fluorescence is increasingly being touted as the future of clinical imaging due
  to its selectivity.
As a college degree has become a requirement for a well paid job the
  selectivity of colleges has gone down.
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