This is the 48th most frequent Romanian word.
fiind
"Fiind" in Romanian means "being."
'fiind' is used here to indicate the state of being busy as the reason for not responding.
Fiind ocupat, nu am putut răspunde imediat.
Being busy, I couldn't respond immediately.
'fiind' introduces a gerund phrase describing the state or quality of the subject.
Mă gândesc la tine, fiind atât de amabil cu mine mereu.
I'm thinking about you, being so kind to me always.
'fiind' expresses a status or role, linking it as the cause or premise for the following action.