(noun, adjective, verb, acronym)


1. serving as or forming a base

- the painter applied a base coat followed by two finishing coats

Similar word(s): basic, basal

2. (used of metals) consisting of or alloyed with inferior metal

- base coins of aluminum

- a base metal

Similar word(s): inferior

3. not adhering to ethical or moral principles

- base and unpatriotic motives

- a base, degrading way of life

Similar word(s): wrong, immoral

4. having or showing an ignoble lack of honor or morality

- that liberal obedience without which your army would be a base rabble

Similar word(s): ignoble, mean, meanspirited

5. illegitimate

Similar word(s): illegitimate, baseborn

6. debased; not genuine

- an attempt to eliminate the base coinage

Similar word(s): counterfeit, imitative

Sentences with base as an adjective:

- base coin;  base bullion

- the base tone of a violin

- A base estate is one held by services not honourable, or held by villenage. Such a tenure is called base, or low, and the tenant is a base tenant.


1. installation from which a military force initiates operations

- the attack wiped out our forward bases

Definition categories: man–made

2. lowest support of a structure

- it was built on a base of solid rock

Similar word(s): foot, foundation, fundament, groundwork, substructure, understructure

Definition categories: man–made, support

3. a place that the runner must touch before scoring

Similar word(s): bag

Definition categories: man–made

4. the bottom or lowest part

- the base of the mountain

Definition categories: object, part, piece

5. (anatomy) the part of an organ nearest its point of attachment

- the base of the skull

Definition categories: location, bottom

6. a lower limit

Similar word(s): floor

Definition categories: communication, control

7. the fundamental assumptions from which something is begun or developed or calculated or explained

Similar word(s): basis, cornerstone, foundation, fundament, groundwork

Definition categories: thought, assumption, supposal, supposition

8. a support or foundation

- the base of the lamp

Similar word(s): pedestal, stand

Definition categories: man–made, support

9. a phosphoric ester of a nucleoside; the basic structural unit of nucleic acids (DNA or RNA)

Similar word(s): nucleotide

Definition categories: substance, ester

10. any of various water-soluble compounds capable of turning litmus blue and reacting with an acid to form a salt and water

- bases include oxides and hydroxides of metals and ammonia

Similar word(s): alkali

Definition categories: substance, compound

11. the bottom side of a geometric figure from which the altitude can be constructed

- the base of the triangle

Definition categories: shape, flank

12. the most important or necessary part of something

Similar word(s): basis

Definition categories: link, component, constituent, part, portion

13. (numeration system) the positive integer that is equivalent to one in the next higher counting place

Similar word(s): radix

Definition categories: quantity, number

14. the place where you are stationed and from which missions start and end

Similar word(s): home

Definition categories: location

15. a terrorist network intensely opposed to the United States that dispenses money and logistical support and training to a wide variety of radical Islamic terrorist groups; has cells in more than 50 countries

Definition categories: group

16. (linguistics) the form of a word after all affixes are removed

Similar word(s): radical, root, stem, theme

Definition categories: communication, descriptor, form, signifier

17. the stock of basic facilities and capital equipment needed for the functioning of a country or area

- the industrial base of Japan

Similar word(s): infrastructure

Definition categories: man–made, fund, stock, store

18. the principal ingredient of a mixture

- glycerinated gelatin is used as a base for many ointments

- he told the painter that he wanted a yellow base with just a hint of green

- everything she cooked seemed to have rice as the base

Definition categories: man–made, ingredient

19. a flat bottom on which something is intended to sit

- a tub should sit on its own base

Definition categories: man–made, bottom, underside, undersurface

20. (electronics) the part of a transistor that separates the emitter from the collector

Definition categories: man–made, electrode

Sentences with base as a noun:

- The logarithm to base 2 of 8 is 3.


1. use as a basis for; found on

- base a claim on some observation

Similar word(s): establish, found, ground

Definition categories: cognition

2. situate as a center of operations

- we will base this project in the new lab

Definition categories: stative, locate, situate

3. use (purified cocaine) by burning it and inhaling the fumes

Definition categories: consumption, drug