Due has 11 different meanings across 4 categories:
Noun · Adjective · Adverb · Proper Noun
a payment that is due (e.g., as the price of membership)
"the society dropped him for non-payment of dues"
Deserved acknowledgment.
"The team's success was due to her relentless work ethic, so she deserved a well-deserved award at the ceremony."
In plain English: In this context, due is not a noun but an adjective meaning something that is expected to happen or be paid at a specific time.
"She is expecting her due date next month."
Usage: Use "due" as a noun only in formal contexts to mean what is owed or deserved, such as paying a debt or receiving recognition. In everyday speech, people usually say "what's due" rather than treating the word itself as a standalone noun.
suitable to or expected in the circumstances
"all due respect"
"due cause to honor them"
"a long due promotion"
"in due course"
"due esteem"
"exercising due care"
capable of being assigned or credited to
"punctuation errors ascribable to careless proofreading"
"the cancellation of the concert was due to the rain"
"the oversight was not imputable to him"
Owed or owing.
"The company's employees were still owed their wages even though payday had already passed."
In plain English: Due means something is scheduled to happen or be ready at a specific time.
"The package is due to arrive tomorrow."
Usage: Use "due" as an adjective to indicate that something has become payable or is expected at a specific time, such as rent being due today. It describes obligations that are owed but does not mean the item itself possesses the quality of being owed in all contexts.
Directly; exactly.
"The train arrived due to the minute we were expecting it, right on schedule."
In plain English: Due means it is time for something to happen or be done.
"The package is due tomorrow."
Usage: Use "due" as an adverb only to mean directly or exactly, typically in phrases like "due east" or "due south." Avoid using it as an adverb when you simply mean "because of," as that usage is incorrect in standard English.
A surname.
"The Due family has lived in that valley for three generations."
The word "due" comes from the Old French verb meaning "to owe," which itself derives from the Latin phrase for "to have from." Originally, it described something that was owed or payable.