Definition of "delta" []

• The fourth letter of the Greek alphabet. See Table at alphabet. (noun)
• An object shaped like a triangle. (noun)
• A usually triangular alluvial deposit at the mouth of a river. (noun)
• A similar deposit at the mouth of a tidal inlet, caused by tidal currents. (noun)
• Mathematics A finite increment in a variable. (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.

• "The term "delta" originally was used to measure risk in options to buy or sell stocks"
• "Joining, what they call a delta formation, the final formation, and that's when the jet crashed and that crash caused damages to eight structures."
• "These trajectories can trade ~15% reduction in delta v for a 100 day travel time, and therefore"