# Boolean Definition

bo͝olē-ən
Designating or of any of a number of mathematical systems, esp. one (Boolean algebra) devised, using algebraic rules and symbols, for the analysis of symbolic logic and now widely used in digital computers since its true-false results are compatible with binary numbers.
Webster's New World
Of or relating to a data type or variable in a programming language that can have one of two values, true or false.
American Heritage
Alternative capitalization of Boolean.
Wiktionary
noun
Alternative capitalization of Boolean.
Wiktionary
other
Use the terms “AND,” “OR” and “NOT” to narrow a search and include or exclude some of the results of a search. By using these logic terms in conjunction with your topic search, you can find niches of information on a subject without having to search through information that is beyond your interest.
YourDictionary
The “AND,” “NOT” and “OR” operators are normally applied to grouping theory and algebra. By using the operators in the correct manner, you can isolate single or small groups of items in a relatively quick manner. In terms of Internet searches, the database you have to work with has millions of entries that examine topics in a variety of subject areas, so this can be especially valuable. To use the Boolean operators, you must begin by defining your general subject by performing a general search on the database for everything that concerns your topic. To maximize your efforts, you can then use the Boolean operators to exclude all the types of information that you aren’t interested in. By excluding the areas and minor topics from the general responses, you will decrease the number of entries that will have to be examined one-by-one. A good way to understand the Boolean process and learn how to apply Boolean logic is to look at a few examples. The process of using Boolean logic begins in a general manner and then you narrow the results, much like the child’s game of 20 Questions. Here's the process:
YourDictionary
To narrow your search to include only those entries that are about African elephants, search “elephants AND African.” Now the answer (set, 2,) contains results that deal only with African Elephants.
YourDictionary
Refine the search results further by searching that set of results (set 2) for entries on mating by typing “answer set 2 AND mating.” The answer to that search should yield the smallest set of entries that you must go through to find your information.
YourDictionary
There are other searching schemes that may reduce your answer set further or allow you to search quicker, but those are based on what the order the search is to be performed in.
YourDictionary

Singular:
Boolean
Plural:
booleans

## Origin of Boolean

• After George Boole

From American Heritage Dictionary of the English Language, 5th Edition

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