What is the greek word for be open?

There isn't one single perfect Greek word for "be open" because the best translation depends heavily on the context. The meaning could refer to:

* Open (as in a door or container): ἀνοικτός (anoiktós) is the adjective meaning "open." The verb would be ἀνοίγω (anoígō) "I open," so you might use a passive construction like ἀνοίγεται (anoígetai) "it is open."

* Open (as in receptive to ideas or suggestions): δεκτικός (dektikós) meaning "receptive" or ἀνοιχτός (anoiktós) could work here, though the nuance changes slightly. You might also use a phrase.

* Open (as in a public event): δημόσιος (dēmosios) meaning "public" might be appropriate.

To give you the most accurate translation, I need more context. What is being open? A door? A mind? A shop? Tell me the sentence and I can give you a better answer.