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Longman Dictionary of Contemporary English
due to
preposition
EXAMPLES FROM CORPUS
▪ He also committed 27 errors -- second in the league -- but many were due to inexperience.
▪ He is due to spend three more years in prison before he is deported to Britain.
▪ His trial was due to take place in December 1989 after he had spent five years on remand.
▪ If the supply of data slowed due to excess use, the cooperative could purchase larger pipes for all to share.
▪ The improvement was due to a higher level of gold ore treated during the period.
▪ The trip was due to start at 10.00am.
▪ The two oil companies, which are due to merge in February, also provide considerable technical assistance.
Wiktionary
due to

prep. caused by; resulting from.

WordNet
due to

adj. (usually followed by `to') able to be 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"; "decide to which of these motives such extraordinary scenes are referable"- Charles Dickens [syn: ascribable(p), due to(p), imputable(p), referable(p)]

Usage examples of "due to".

It had gotten dark early, in part due to the heavy overcast, and the chill, damp air, though windless, had gotten colder yet.

Any merchant found charging one price to a native and a higher price to a soldier-provided, of course, that the price difference wasn't due to the soldier being a poor hand at haggling-was brought up before his own fellow merchants and fined four times the difference in the price, half of which went to the Merchant's Guild, one quarter to the Imperial coffers, and one quarter to the fellow who was cheated.

It was possible that his faint was due to brushing up against such protections.