The difference between Extra and Extraneous
When used as adjectives, extra means beyond what is due, usual, expected, or necessary, whereas extraneous means not belonging to, or dependent upon, a thing.
Extra is also noun with the meaning: something additional, such as an item above and beyond the ordinary school curriculum, or added to the usual charge on a bill.
Extra is also adverb with the meaning: to an extraordinary degree.
check bellow for the other definitions of Extra and Extraneous
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Extra as an adjective:
Beyond what is due, usual, expected, or necessary; extraneous; additional; supernumerary.
Examples:
"extra work; extra pay"
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Extra as an adjective (dated):
Extraordinarily good; superior.
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Extra as an adjective (North America, slang):
Over-the-top; going beyond what is normal or expected, often in a dramatic manner.
Examples:
"You deleted your photos of her because she lost your Snapchat streak!? You're so extra!"
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Extra as an adverb (informal):
To an extraordinary degree.
Examples:
"That day he ran to school extra fast."
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Extra as a noun:
Something additional, such as an item above and beyond the ordinary school curriculum, or added to the usual charge on a bill.
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Extra as a noun:
An extra edition of a newspaper, which is printed outside of the normal printing cycle.
Examples:
"Extra, extra! Read all about it!"
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Extra as a noun (cricket):
A run scored without the ball having hit the striker's bat - a wide, bye, leg bye or no ball; in Australia referred to as a sundry.
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Extra as a noun (acting):
A supernumerary or walk-on in a film or play.
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Extra as a noun:
Something of an extra quality or grade.
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Extraneous as an adjective:
Not belonging to, or dependent upon, a thing; without or beyond a thing; foreign
Examples:
"to separate gold from extraneous matter"
"Extraneous substances were found on my cup of water."
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Extraneous as an adjective:
Not essential or intrinsic