Did you know?

Click any word in a definition or example to find the entry for that word

booster

 - definition
Close

What are red words?

90% of the time, speakers of English use just 7,500 words in speech and writing. These words appear in red, and are graded with stars. One-star words are frequent, two-star words are more frequent, and three-star words are the most frequent.

Close

Thesaurus

The thesaurus of synonyms and related words is fully integrated into the dictionary entries. Click on the T button in an entry to review the synonyms and related words for that meaning.

more
noun [countable] American English pronunciation: booster /ˈbustər/ 
Word Forms
Close
singularbooster
pluralboosters

Related dictionary definitions

  1. 2
    something that makes you feel more confident, more healthy, etc.

    Fruit is an excellent health booster.

    confidence/morale booster:

    A new haircut can be a great confidence booster.

  2. 4
    American someone who publicly supports a person, plan, or organization

    The new airport, say its boosters, would do a lot for the local economy.

food rave

a very large party where people eat, sell or share many different types of food, usually held outside or in a large public building

BuzzWord Article

Word of the Day

threadbare

threadbare clothing, carpet, or cloth is very thin and almost has holes in it because it has been...

Open Dictionary

dead white (European) male

a man … whose achievements may have been overestimated because he belonged to the gender and ethnic group … that was dominant at the time

add a word

Blog

A must for anyone with an interest in the changing face of language. The Macmillan Dictionary blog explores English as it is spoken around the world today.

global English and language change from our blog