Straightaway

Noun

 * 1) A straight section of a racetrack.

Adverb

 * 1) At once; immediately.

Adjective

 * 1) extending into the distance in a straight line.

Thesaurus
PDQ, air line, all at once, all together, apace, at a blow, at a stroke, at once, at one blow, at one jump, at one stroke, at one swoop, at one time, away, axis, beeline, chord, decisively, diagonal, diameter, direct, direct line, directly, directrix, edge, expeditiously, first, forthwith, great-circle course, immediate, immediately, in a hurry, in no time, instanter, instantly, irreversible, normal, now, on the instant, on the spot, one-way, per saltum, perpendicular, pretty damned quick, promptly, pronto, quickly, radius, radius vector, right away, right line, right now, right off, secant, segment, shortcut, side, simultaneously, smartly, speedily, straight, straight course, straight line, straight stretch, straightforward, straightway, streamline, subito, summarily, swiftly, tangent, then and there, this minute, this very minute, transversal, unbroken, undeviating, unidirectional, uninterrupted, uno saltu, unswerving, vector, with all speed, without delay, without further delay

Alternative forms

 * straightway