noun
- the eighth letter of the Greek alphabet (Θ, θ)
- a symbol used in mathematics and science to represent an angle or unknown quantity
Usage: mathematics; science
Examples
- The Greek letter theta appears in many mathematical formulas.
- In trigonometry, theta often represents an angle in a triangle.
- The professor wrote theta on the board to denote the unknown angle.
- Ancient Greek inscriptions contain the letter theta.
- Students learn to recognize theta as part of the Greek alphabet.
- The equation included theta as a variable for the rotation angle.