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The definition of a Johnny-come-lately is a newcomer, or is someone who is late to accepting a position or late to arriving at an event.
A newcomer to an idea who is late in accepting what everyone else already believes to be true is an example of a Johnny-come-lately.
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
noun pl. Johnny-come-latelies
one who is late or recent in arriving at a place, position, or viewpoint
Used by arrangement with John Wiley & Sons, Inc.
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
noun pl. John·ny-come-late·lies
or John·nies-come-late·ly Informal
A newcomer or latecomer, especially a recent adherent to a cause or trend.
johnny-come-lately - Phrases/Idioms
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.
A newcomer, as in She may be a Johnny-come-lately on the board, but she's doing a fine job with publicity. [1830s]