Reaction. A counterforce; acting against.
Recognize. To know; seeing, hearing, or feeling, and having knowledge therefrom.
Reflection. Considering; judging one thing by the examination of another. A beam of light, or an object, leaving a surface.
Refraction. That peculiarity in a beam of light, which, in passing through water at an angle, bends out of its course and again assumes a direct line after passing through.
Reflex. Turned back on itself, or in the direction from which it came.
Requisite. Enough; suffieient for all purposes.
Relegate. To put back or away.
Rectangular. Having one or more right angles.
Reservations. Land which is held by the Government for various purposes.
Resistance. That which holds back; preventing movement.