Delta
Definition
The fourth letter of the Greek alphabet (uppercase Δ, lowercase δ), commonly used in mathematics, physics, and engineering to denote a change, difference, or increment (e.g., Δx for change in x).
A landform that is a triangular or fan-shaped deposit of sediment at the mouth of a river, formed where the river flows into a slower-moving or standing body of water like a sea or lake.
A small but significant change or difference, often used colloquially in business, tech, or everyday contexts (e.g., 'price delta').
(Capitalized as Delta) A major U.S. airline, Delta Air Lines, known for its hub in Atlanta and a history of mergers that make it the largest by market share.
Examples
My fitness app showed a delta of 2 miles on my run today—turns out coffee is the real superpower.
The Mississippi Delta blues scene birthed legends, proving mud and hardship make the best guitar solos.
Engineers tweaked the delta-v on the rocket, because nobody wants a spaceship that fizzles out mid-orbit like a bad fireworks show.
Booking Delta for my trip? Hope the flight delta isn't measured in hours of turbulence therapy.