from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. That can be counted: countable items; countable sins.
- adj. Mathematics That can be put into a one-to-one correspondence with the positive integers.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Capable of being counted; having a quantity or a numerical attribute.
- adj. Having a bijection with a subset of the natural numbers.
- adj. Countably infinite; having a bijection with the natural numbers.
- adj. Freely usable with the indefinite article and with numbers, and therefore having a plural form.
from the GNU version of the Collaborative International Dictionary of English
- adj. Capable of being numbered.
from The Century Dictionary and Cyclopedia
- Capable of being counted, numbered, or reckoned.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. that can be counted
The usage is therefore uncountable rather than countable, which is why 'fewer' sounds odd and 'less' would be the preferred option.
Sets that have cardinality Aleph-naught are said to be "countably infinite", whereas sets with higher cardinalities are not "countable".
We didn't have to wait long before the cars were out on track again and I got the 'countable' road course race under my belt.
Their home will not be a "countable" asset, as long as she resides there.
"countable" by any stretch of my imagination; on the other hand, if I am to hold myself to things which are strictly "countable," I would be doing a huge disservice to the kids I'm trying to educate.
But in this video love is a countable noun and book is uncountable.
When a group is made up of countable objects, it's not "less", it's "fewer".
Normally, a countable noun (like heart) requires a determiner (a, the, my, this …) But ellipsis seems to be quite common in this labelling function.
But all nouns in English have the potential to be both countable and nouncountable.
Now that "friends" are listed and countable, the web invites people to know that they don't have enough friends, that if they launch a blog and no one comes, that no one appreciates them.