This is the 8645th most frequent Russian word.
открыто
"Openly" or "open."
Here, 'открыто' is used as an adjective, describing the state of the door.
Дверь была открыто, поэтому я вошёл.
The door was open, so I entered.
In this sentence, 'открыто' functions as an adverb, showing the manner of speaking.
Он говорил открыто о своих чувствах.
He spoke openly about his feelings.
Here, 'открыто' is used as an adverb again, describing the way plans were discussed.