* It's a misspelling: Perhaps you mean a similar-sounding word like κλίμα (klima), which means "climate" or "slope." This is the most likely possibility.
* It's a dialectal or archaic word: Greek has many dialects and archaic forms. The word might exist in a less common form.
* It's a loanword or a neologism: It could be a word borrowed from another language or a newly coined word.
To get a definitive answer, you'd need to provide more context, such as where you encountered this word.