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

pup

a baby of particular animals, or a puppy

Word of the Day

I won’t tolerate it! Replacing formal words with phrasal verbs.

by Liz Walter,
April 01, 2015
When you are using a language, it is important to understand if a word is formal or informal, so that you can use it in an appropriate way. You might hear people saying dosh for money, or spud for potato, but they wouldn’t write those words in a formal essay. Similarly, a

Read More 

stackin’ p

March 30, 2015
idiom slang earning a lot of money ‘That’s a very generous present.”Yeah, well, she’s stackin’ p, innit?’

Read More