1. Descent in a direct male line.

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

• agnatian,
• zgnation,
• sgnation,
• wgnation,
• qgnation,
• afnation,
• avnation,
• ahnation,
• aynation,
• atnation,
• agbation,
• agmation,
• agnatin,
• agnatio,
• antation,
• Agnasion,
• Agnatione,
• Angnation,
• Agrnation,
• Agnenation

• agenda item,
• agamidae,
• agnatic,
• agent,
• agent bank,
• agnathan,
• agenda,
• agential,
• agnate,
• agamid,
• agnatha.

The adjective form of the word "agnation" would be "agnate".

The plural of the "agnation" can be the "agnations".

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