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define Google Operator

Use the define operator to list definitions of the submitted word(s).

Examples: define:lol

Unlike other operators, Google does not expand the search term(s). You have to enter the search term(s) with the exact spelling of the word(s) as intended. As such, this operator frequently shows no results when multiple words are used.

define:rain cats and dogs
define:raining cats and dogs
define:rained cats and dogs

Definitions of some symbols and nothing will display unpredictable results.
Examples of unpredictable results:

The define operator cannot be used with other operators.