Q-a Definition

letter

The seventeenth letter of the English alphabet, called cue and written in the Latin script.

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numeral

The ordinal number seventeenth, derived from this letter of the English alphabet, called cue and written in the Latin script.

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abbreviation

Question or questions.

Q and A.
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Quarter.

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The supposed common source (protogospel) of the Gospels of Mark and Luke (from German Quelle, source)

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The Q factor in electronics.
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(astronomy) Quasar.

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pronoun

The pseudonym of Sir Arthur Quiller-Couch.

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