Click any word in a definition or example to find the entry for that word
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.
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.
He has two brothers and two sisters.
She has to babysit for her little sister tonight.
the day/night sister
My leg is still hurting me, Sister.
support for our sisters in the armed forces
This is the British English definition of sister. View American English definition of sister.
Change your default dictionary and thesaurus to American English.
View the pronunciation for sister.
used with other nouns to describe the unexpected and often unwanted effects of a particular situation or trend
the bone at the front of your lower leg, between your knee and your ankle. A more usual word is...
a woman in middle age who has to juggle caring for teenage children and ageing parents with a career
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.
Definition of sister from the online English dictionary from Macmillan Publishers Limited.