The definition of analog is something that has some common traits with something else.
(noun)A burger made of soy is similar to a burger made of beef so it is an example of an analog.
Analog is defined as a watch that uses hands moving around the face of the watch to indicate time, rather than digital numbers.
(noun)An example of analog is a watch where the big hand is on the 12 and the little hand on the 2.
See analog in Webster's New World College Dictionary
adjective
noun
See analog in American Heritage Dictionary 4
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