i.e.
I.e. (abbreviation) means used before a restatement that explains or defines exactly what has just been said, meaning 'that is' or 'in other words'. Example: “The fee is due at the end of the quarter, i.e. 31 March.”
How to Use I.e.
Learner’s notesIn plain EnglishA short way of writing 'that is'.
Written English only; say 'that is' or 'in other words' when speaking.
Remember i.e. = 'in essence' and e.g. = 'example given'. The mnemonic is not the real etymology, but it keeps the two apart.
Trace the full origin ↓Etymology
An abbreviation of Latin id est, meaning 'that is'.
Synonyms
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Rhymes for i.e.
See all rhymes for i.e. →Frequently Asked Questions
What is the difference between i.e. and e.g.?
I.e. introduces a restatement of the whole thing you just mentioned, so what follows is complete and exact. E.g. introduces one or two examples drawn from a larger set. 'Citrus fruit, i.e. fruit of the genus Citrus' defines the term, while 'citrus fruit, e.g. lemons' merely samples it.
Do you put a comma after i.e.?
American style guides generally ask for a comma after i.e.; British style usually leaves it out. Whichever you choose, apply it consistently through a document.
Should i.e. be written with full stops?
The traditional form is i.e. with a full stop after each letter, and this is still standard in edited prose. Some house styles now print it as ie, particularly in British newspapers.