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1. It doesn't matter; it's not important. A: "Sir, we're running low on supplies." B: "No matter, we'll be pulling into port shortly." I could have dropped him off when I went out to get groceries, but no matter.
2. Regardless of; irrespective of. We'll get her the very best treatment available, no matter the cost!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
1. It's not important, as in She wasn't home when I came by, but no matter. [Mid-1500s]
2. Also, no matter what. Regardless, it makes no difference, as in No matter what I say, she'll do what she likes, or The car must be repaired, no matter what. [Mid-1500s]
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Regardless of: "Yet there isn't a train I wouldn't take, / No matter where it's going" (Edna St. Vincent Millay).
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.