My definition of a redundancy... vs My definition of redundancy...

[Gray]

"My definition of a redundancy is an air-bag in a politician's car." ~ Larry Hagman

Is the article 'a' redundant here?
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First lesson - English, not english. I, not i. ~A student of English

[Mister Micawber]

No; the word can be considered either countable or uncountable. Larry Hagman has chosen the former.
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Native English teacher at Mister Micawber's