1. Immediately; without delay.

2. Immediately.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• strightaway,
• straighaway,
• straightaway,
• strayghtaway,
• atraightway,
• ztraightway,
• xtraightway,
• dtraightway,
• etraightway,
• wtraightway,
• srraightway,
• sfraightway,
• sgraightway,
• strightway,
• straighway,
• strayghtway,
• straitway,
• straihgtways,
• Streightways,
• straightwaie

• straight flute,
• straight chair,
• straight hang,
• straightness,
• stargazing,
• straight sinus,
• straight pin,
• star sign,
• straight poker,
• straight flush,
• straight-laced,
• straightjacket,
• straight angle,
• straight razor,
• straight line,
• straightener,
• steerageway,
• straightarrow,
• straighten up,
• straightaway,
• Streight,
• straightedge,
• straighten out,
• straight arrow,
• straightlaced,
• steerage,
• straight-out,
• straighten,
• straight off,
• straight,
• straight man,
• straight-arm,
• straight face,
• straight chain,
• straight arch.

The adjective form of the word "straightway" is "straightway".

The plural form of "straightway" is "straightways"

The singular form of the word "straightway" is "straightway". The word itself is already singular and does not have a different form for the singular and plural.