Right, in a mathematical sense; direct; passing from one point to another by the nearest course; not deviating or crooked; as a straight line; a straight course; a straight piece of timber.

Narrow; close; tight; as a straight garment.

Upright; according with justice and rectitude; not deviating from truth or fairness.

Immediately; directly; in the shortest time. I know thy generous temper well; fling but the appearance of dishonor on it, it straight takes fire, and mounts into a blaze.