Right

adjective

1. Straight, not bent.

   "a right line"

2. Of an angle, having a size of 90 degrees, or one quarter of a complete rotation; the angle between two perpendicular lines.

   "The kitchen counter formed a right angle with the back wall."

3. Of a geometric figure, incorporating a right angle between edges, faces, axes, etc.

   "a right triangle, a right prism, a right cone"

4. Complying with justice, correctness or reason; correct, just, true.

   "I thought you'd made a mistake, but it seems you were right all along."

5. Appropriate, perfectly suitable; fit for purpose.

   "Is this the right software for my computer?"