Definition of "spark" []

• An incandescent particle, especially: (noun)
• One thrown off from a burning substance. (noun)
• One resulting from friction. (noun)
• One remaining in an otherwise extinguished fire; an ember. (noun)
• A glistening particle, as of metal. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Twenty years on, they become quantified and rigidized, and it's not where the spark is anymore."
• "He says his yellow vest translates to the word "spark.""
• "The main spark was Lincoln winning in 1860 and trying to ban slavery."