- (uncountable) The doctrine that all things exist or are controlled by chance.
- (countable) A casual or informal word or phrase.
- Avoid casualisms when writing business letters.
Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.