Verb
To extend under, or be opposed to; as, the line of a triangle which subtends the right angle; the chord subtends an arc.
Source: Webster's dictionaryDefinition Section of cone (1) and spherical cap (2) that subtend a solid angle of one steradian inside a sphere A steradian can be defined as the solid angle subtended at the center of a unit sphere by a unit area on its surface. Source: Internet
It is the distance at which the mean radius of the Earth's orbit would subtend an angle of one arcsecond. Source: Internet
Hence, all inscribed angles that subtend the same arc (pink) are equal. Source: Internet
In fact, little is known about the angle that membrane proteins subtend to the plane of the membrane; this is a problem difficult to address with available technologies. Source: Internet
We can assume without loss of generality that the aperture happens to subtend solid angle dΩ when "viewed" from the emitting area element. Source: Internet