In a polite, considerate way; also used as a formal letter closing before the signature.
“Respectfully, Maria Gomez, Tenant Association President”
“I respectfully disagree with the decision outlined in your letter.”
Besides appearing as a closing, this word often softens a disagreement or request, as in 'I respectfully disagree.' Noticing it helps you judge the letter's tone as formal but polite, which is useful for tone-related questions in Part 1.
Synonyms: politely, courteously, deferentially