1. The act of retaining; the power of retaining, specially ideas in the mind; restraint.

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

• pretenation,
• rotection,
• rentention,
• detension,
• protention,
• redemtion,
• retenion,
• detintion,
• redemntion,
• redeption,
• etention,
• retintion,
• rention,
• ttention,
• etension,
• rendention,
• decention,
• retension,
• detantion,
• retennion

• retentively,
• retentivity,
• retentive.

The adjective form of the word "retention" is "retentive".

The plural of the "retention" can be the "retentions".

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