1. Eight times the quantity.

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

• wightfold,
• sightfold,
• dightfold,
• rightfold,
• 4ightfold,
• 3ightfold,
• eughtfold,
• ejghtfold,
• ekghtfold,
• eoghtfold,
• e9ghtfold,
• e8ghtfold,
• eifhtfold,
• eivhtfold,
• eibhtfold,
• eightfolf,
• eigfhtfold,
• eightyfold,
• eighfold,
• rightfild

• eighty-four,
• uphold,
• unfold,
• outfield,
• right fielder,
• eighty-five,
• eight ball,
• eightvo.

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

The plural form of "eightfold" is also "eightfold" since it is an adjective that does not change in its plural form.

The singular form of the word "eightfold" is "eightfold". It remains the same in both singular and plural forms.