What does 'opposite' refer to in the context of a triangle?

In the context of a triangle, particularly when discussing the trigonometric functions and relationships, 'opposite' specifically refers to the side that is located across from a particular angle of interest, often denoted as theta (θ). For instance, in a right triangle, if you identify one of the non-right angles as theta, the opposite side is the one that does not touch the angle and is directly across from it. This distinction is crucial for applying trigonometric ratios like sine and tangent, which are defined in relation to the opposite side. The concepts of adjacent and hypotenuse sides are also important in trigonometry but do not define the opposite side. Hence, selecting the side opposite to angle theta provides clarity when dealing with trigonometric calculations and problem-solving in geometry.