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functional dependency

   Also found in: Acronyms, Wikipedia 0.04 sec.
(database)functional dependency - Given a relation R (in a relational database), attribute Y of R is functionally dependent on attribute X of R and X of R functionally determines Y of R (in symbols R.X -> R.Y) if and only if each X in R has associated with it precisely one Y in R (at any one time). Attributes X and Y may be composite.

This is very close to a function in the mathematical sense.
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Cognitive impairment, very advanced age, and severe functional dependency were perceived as decreasing the likelihood of benefit from physical therapy in this study.
The impact of physical therapy on nursing home patient outcomes by Rubenstein, Lisa V. / Physical Therapy
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