Generally, you don't use quotation marks for dictionary definitions:
* APA Style: Does not use quotation marks for definitions.
* MLA Style: Does not use quotation marks for definitions.
* Chicago Manual of Style: Does not use quotation marks for definitions unless the definition is a direct quote from a source.
However, there are exceptions:
* If the definition is a direct quote: You would use quotation marks around the definition if you are quoting it directly from a dictionary or other source.
* If the definition is a phrase or sentence: You might use quotation marks if you are using the definition as a phrase or sentence in your writing.
Example:
* Without quotation marks: The definition of "serendipity" is "the occurrence and development of events by chance in a happy or beneficial way."
* With quotation marks: The dictionary defines "serendipity" as "the occurrence and development of events by chance in a happy or beneficial way."
Best practice:
* If you are unsure, it's best to consult the style guide you are using.
* If no specific style guide is provided, aim for clarity and avoid unnecessary punctuation.
Let me know if you have any other questions!