What does the French word rit mean?

"Rit" is not a word in French. It's possible you meant a similar-sounding word, such as:

* "Rire": This means "to laugh"

* "Ritz": This is a proper noun, often referring to the Ritz-Carlton hotel chain.

* "Rite": This is a loanword from English, meaning a religious or ceremonial act

Please provide more context or the full phrase where you encountered "rit" so I can help you find the correct meaning.