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'In other words' reformulates what was said more clearly; 'namely' specifies or lists the exact elements of a statement.
Side-by-side comparison
"In other words" rephrases what you just said in a clearer or simpler way. You are telling your listener: "let me put it another way".
The doctor said I need to reduce sodium; in other words, I have to eat less salt.
The event is free for members; in other words, if you are not a member, you pay full price.
The film had no real plot and lasted three hours; in other words, it was a waste of time.
It works as a bridge between a complex idea and a more accessible version of it. Use it when you want to make sure your message landed clearly.
Only two students passed the exam, namely Maria and Carlos.
We visited three cities on the trip: specifically, Lisbon, Porto, and Sintra.
She is good at two sports, namely swimming and cycling.
Common mistake
Common error with i.e. vs e.g.: "i.e." = complete reformulation (no other options). "e.g." = partial sample (there are more). If Python is just one example: "e.g., Python", not "i.e., Python". Also: never say "i.e." aloud, say "that is" or "in other words".
Trick to remember it
- •Can you add "etc." at the end without changing the meaning? = "e.g." (there are more options).
- •Is the list complete and the only correct interpretation? = "i.e." (total reformulation).
- •"Namely" introduces a specific list of elements, not an example.
Quick rule
- •"In other words / i.e." = reformulate the same idea.
- •"Namely" = specify the exact elements.
- •"E.g." = partial examples.
- •Never say "i.e." aloud: say "that is".
Did you know?
i.e. and e.g. are two of the most confused abbreviations in written English, and the error is made even by educated native speakers. The confusion is so widespread that many scientific journal editors now ask authors to replace "i.e." and "e.g." with "that is" and "for example" to avoid ambiguity. The abbreviations come from Latin: "id est" (i.e. = that is) and "exempli gratia" (e.g. = for the sake of an example). In the original Latin the distinction was perfectly clear; the confusion in modern English demonstrates that opaque abbreviations, by stripping away meaning transparency, favor error.
Practise what you learned
Exercise 1 · Pick the right one
She said she needed more space. _____, she wanted to end the relationship.
Exercise 2 · Pick the right one
He failed every test this term. _____, he needs to study much harder.
Exercise 3 · Form the word
Related word pairs
'As a result' introduces a factual consequence; 'therefore' expresses a logical conclusion or inference.
'For example' is a connector introducing a separate example; 'such as' introduces examples within the same clause.
'Because' introduces the main cause or a new reason; 'since' and 'as' introduce secondary or already-known reasons.
'A' is used before consonant sounds; 'an' is used before vowel sounds.
Bryan López
Founder of SpeakUP Academy