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Longman Dictionary of Contemporary English
question mark
noun
EXAMPLES FROM CORPUS
▪ All the mirrors grew convex, she fingered the globe in its pregnant question mark.
▪ Another question mark will be how the offering apportions the values of Wired, HotWired and HardWired.
▪ But when he looked at me, that furrow of care between his eyes turned into a question mark.
▪ If the bolts were responsible, then a further question mark will hang over the future of the industry.
▪ In the middle was a sharp little machine self-portrait, with a blinking question mark inside on the screen inside the screen.
▪ They grew up in the Depression, when the certainty of a meal was a question mark.
▪ Why did it have a question mark?
The Collaborative International Dictionary
question mark

Interrogation \In*ter`ro*ga"tion\, n. [L. interrogatio: cf. F. interrogation.]

  1. The act or process of interrogating or questioning; examination by questions; an instance of interrogating; inquiry.

  2. A question put; an inquiry.

  3. A point, mark, or sign, thus [?], indicating that the sentence with which it is connected is a question. It is used to express doubt, or to mark a query. Usually called a question mark; called also interrogation point.

    Note: In works printed in the Spanish language this mark is not only placed at the end of an interrogative sentence, but is also placed, inverted [as thus ([iques])], at the beginning.

Wiktionary
question mark

n. 1 The punctuation mark “?”, used at the end of a sentence to indicate a question. 2 (context idiomatic English) doubt or uncertainty

WordNet
question mark

n. a punctuation mark (?) placed at the end of a sentence to indicate a question [syn: interrogation point]

Wikipedia
Question mark

The question mark [ ? ] (also known as interrogation point, query, or eroteme in journalism) is a punctuation mark that indicates an interrogative clause or phrase in many languages. The question mark is not used for indirect questions. The question mark glyph is also often used in place of missing or unknown data. In Unicode, it is encoded at .

Question mark (disambiguation)

A question mark is a type of punctuation mark.

Question mark or ? may also refer to:

Question Mark (aircraft)
Question Mark (1960s TV series)

Question Mark is a Canadian current affairs television series which aired on CBC Television from 1963 to 1964.