noun the angle formed between two lines or rays that extend from the ends of an arc or chord
verb to extend or stretch underneath or across something
In geometry, the word 'subtend' is used to describe the relationship between an angle and the line segment it creates, where the angle is formed by two rays that originate from the endpoints of the line segment.
In optics, 'subtend' is used to describe the angle subtended by an object at the eye or at a lens.
In astronomy, 'subtend' is used to describe the angle subtended by a celestial object as seen from Earth.
In physics, 'subtend' is used to describe the angle between two points on a curve or the angle between two vectors.
In geometry, a writer may use the term 'subtend' when discussing angles and lines in a story or article.
A psychologist may use 'subtend' when explaining visual perception or cognitive processes to clients or in research papers.