1. Consisting of four; by fours; above the Tertiary.

2. The number four.

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

• quarternary,
• quaternay,
• vaternary,
• quanternary,
• quatinary,
• 1uaternary,
• 2uaternary,
• wuaternary,
• auaternary,
• qyaternary,
• quaternaey,
• quaternery,
• quaternte,
• quaternat,
• quatrenity,
• quaterday,
• quaterfeil,
• quaternairy,
• queternery,
• quartenary

• quaternate,
• quaternion,
• quaternity,
• quatrain,
• quatern.

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

The plural of the "quaternary" can be the "quaternaries".

The singular of the "quaternary" can be the "quaternary".