a variable quantity that cannot be resolved into components
"In classical mechanics, mass is treated as a scalar because it cannot be resolved into directional components like force or velocity."
A quantity that has magnitude but not direction; compare vector.
"The temperature in the room is a scalar value because it only tells you how hot it is without indicating any specific direction."
"The teacher asked students to provide scalar answers like five apples instead of saying half an apple."
of or relating to a directionless magnitude (such as mass or speed etc.) that is completely specified by its magnitude
"scalar quantity"
Having magnitude but not direction.
"The mass of the object is a scalar quantity because it has magnitude but no direction."
In plain English: Scalar describes something that has only size and no direction, like how fast you are running but not which way you're going.
"The scalar value increased steadily throughout the experiment."
Usage: Use scalar to describe quantities like temperature or mass that have only size, distinguishing them from vectors which also include direction. This adjective applies specifically when the measurement is independent of any spatial orientation.
The word scalar comes from the Latin scālaris, meaning "of a ladder," which itself derives from scandere, to climb. Its specific mathematical sense referring to a quantity with magnitude but no direction was coined by William Rowan Hamilton in 1846.