Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “base”

See all translations

base

noun

base noun (BOTTOM)

   /beɪs/ [C] the bottom of an object; the part on which it rests: This lamp has a heavy base so it won’t tip over. geometry    /beɪs/ [C] A base angle is one of the two equal angles that include the bottom of an isosceles triangle .

base noun (MAIN PLACE)

   /beɪs/ [C] the place from which a business operates or a person works: We have an office in San Diego, but Washington is still our base.    /beɪs/ [C] A base is also a place from which the military operates that provides weapons storage and housing: The military has bases all over the US.

base noun (SUBSTANCE)

biology /beɪs/ [C] one of four chemical substances that make up the part of DNA and RNA that controls the structure of genes

base noun (CHEMICAL)

chemistry /beɪs/ [C/U] any of various chemical substances that have the opposite effect or chemical behavior as that of an acid

base noun (NUMBER)

mathematics /beɪs/ [C] a number that is multiplied by itself: In 6³, 6 is the base and it is multiplied by 6 three times.

base noun (MAIN PART)

   /beɪs/ [C usually sing] the main part of something, or the people or activities that form the main part of something: The sauce has an olive oil base. Tourism remains the city’s economic base. He’ll need a wide base of regional support to win the election.

base noun (WORD PART)

grammar /beɪs/ [C] a word or word part to which prefixes and endings may be added to make new words, as in "do," the base of "redo" and "doable"

base noun (BASEBALL)

   /beɪs/ [C] (in the game of baseball) one of the four angles of a square, all of which a player must touch in order to score: He reached first base on a single.

base

verb [T always + adv/prep]  /beɪs/ us  
to establish a place as the place from which a business operates or a person works: Where is your company based?
(Definition of base from the Cambridge Academic Content Dictionary © Cambridge University Press)
What is the pronunciation of base?
Add Cambridge dictionaries to your browser to your website

Definitions of “base” in other dictionaries

Word of the Day

luck

the force that causes things, especially good things, to happen to you by chance and not as a result of your own efforts or abilities

Word of the Day

A certain je ne sais quoi: French words and phrases used in English

by Liz Walter,
January 21, 2015
It is an odd irony that the more sophisticated your use of English is, the more likely you are to use French words and phrases. Or, to be more accurate, ones you know to be French – words such as ballet, au pair, abattoir, fiancé, café, and restaurant are so entrenched in

Read More 

micro pig noun

January 26, 2015
an extremely small pig, bred to be a pet Micro pigs have become popular pets recently, with famous owners including Victoria Beckham, Paris Hilton and Olympic diver, Tom Daley.

Read More