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Definition: Gamma distribution is a distribution that arises naturally in processes for which the waiting times between events are relevant. It can be thought of as a waiting time between Poisson distributed events. Probability density function: The waiting time until the hth Poisson event with a rate of change Î» is.
Medical Definition of gamma. 1  1: the third letter of the Greek alphabetâsymbol Î³ or Î³. 2  2: a unit of magnetic flux density equal to one nanotesla. 3  3: gamma rayâusually used as the attributive form of gamma ray gamma counter.  4: microgram 1.