0 to try to find a piece of information by looking in a book or on a computer:
If you don't know what the word means, look it up in a dictionary.
How can you look the word up if you don't know how to spell it?
The software looks up words automatically.
Does anybody look up slang words in the dictionary?
I had to look up the word 'possession' to check how to spell it.
You could try looking him up in a dictionary of biography.
