What is the Greek word for single?

There isn't one single perfect Greek word for "single" that covers all its English meanings. The best translation depends on the context:

* For unmarried: μόνος (monos) means "alone" or "single" in the sense of not being married. This is probably the closest single-word equivalent in many situations.

* For a single item: ενιαίος (eniaios) means "single," "sole," or "one" as in a single item or unit. μόνος could also work here depending on the context.

* For single as in "only": μόνο (mono) is an adverb meaning "only" or "solely."

Therefore, you need to consider the *specific meaning* of "single" to choose the appropriate Greek word.