The Latin root tactus is part of the word tangent. What does the word tangent mean?

touching

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Explanation:

tan·gent  

noun: tangent; plural noun: tangents

1.  a straight line or plane that touches a curve or curved surface at a point, but if extended does not cross it at that point.

2.  a completely different line of thought or action.

"he quickly went off on a tangent about wrestling"

3.  MATHEMATICS  the trigonometric function that is equal to the ratio of the sides (other than the hypotenuse) opposite and adjacent to an angle in a right triangle.

adjective: tangent

(of a line or plane) touching, but not intersecting, a curve or curved surface.

"this curve is tangent to the average cost curve"

ITS TOUCHING

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