recently I thought of getting a new dictionary. What is the dictionary that has the most examples (especially sentences examples)?
closed as off-topic by Mari-Lou A, tchrist♦, JHCL, Hellion, Brian Hooper Oct 28 '15 at 17:16
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As per Mary Lou, the OED2 comes in two versions: the first is the 20 volume dictionary, the price of which costs 995 new on Amazon ; the second is a compact, micrographic version, which costs 1/3 of the price of the 20 volume set at $377 on Amazon  and isn't portable either as it is gigantic.
As for portable dictionaries, I would say that it depends on which side of the pond you're on; if you're English, you could probably go for a pocket OED (price on Amazon: $13.26 ) or pocket Collins English Dictionary (price on Amazon: $9.38 ).
If you're American, then pocket Websters (price on Amazon: $5.95 ) is about the only one I know of that has a pocket dictionary in America; I would've recommended American Heritage as well, but it seems it doesn't have a pocket dictionary from my search.
On all of these dictionaries, I can't say which has the most example sentences as I've never owned any pocket other than Websters, which didn't have any but as its copyright is 2003, its newer may have them.
I suggest pocket dictionaries as you said you were looking for portable ones and thus chose to omit desk dictionaries, with the exception of my original answer.