1. Having a due comparative relation; being in suitable proportion; having the same ratio.

2. A quantity proportional. Mean proportional, of two quantities, the square root of their products.

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

• propotional,
• proporcional,
• proportial,
• proprtional,
• proporional,
• proportiond,
• unproportional,
• porportional,
• proportionatly,
• proprotional,
• proportinal,
• preportional,
• prepostional,
• inproportional,
• promortional,
• promontional,
• prportional,
• promoational,
• proportionaly,
• proportioanl

• preparatory,
• preformation,
• proportionality,
• proportionate,
• proportion,
• proportionally,
• proportionable,
• proportional to,
• proprionamide,
• proportionately,
• preparation.

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

The plural form of the word "proportional" is "proportionals"

The singular form of the word "proportional" is "proportion"