Longman Dictionary of Contemporary English
The Collaborative International Dictionary
Interrogation \In*ter`ro*ga"tion\, n. [L. interrogatio: cf. F. interrogation.]
The act or process of interrogating or questioning; examination by questions; an instance of interrogating; inquiry.
A question put; an inquiry.
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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
n. 1 The punctuation mark “?”, used at the end of a sentence to indicate a question. 2 (context idiomatic English) doubt or uncertainty
WordNet
n. a punctuation mark (?) placed at the end of a sentence to indicate a question [syn: interrogation point]
Wikipedia
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 .
A question mark is a type of punctuation mark.
Question mark or ? may also refer to:
Question Mark is a Canadian current affairs television series which aired on CBC Television from 1963 to 1964.