1. Before this; ago.

2. Because that.

3. After; from the time that.

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

• saince,
• serce,
• sinze,
• sinces,
• sonci,
• sienced,
• sinc,
• sinues,
• sonme,
• hince,
• sinxw,
• sorce,
• sisne,
• silnece,
• sicnce,
• sincre,
• linece,
• biance,
• sincle,
• sarce

• SINEs,
• simes,
• siamese,
• siems,
• simoes,
• simek,
• singe.

The adverb form of the word "since" is "sincerely".

The adjective form of "since" is "sincere".

The plural form of the word "since" is "sinces." However, it is important to note that "since" is not commonly used in the plural form, as it is typically used as a conjunction or adverb.

The singular form of the word "Since" is "Since". Since is already in its singular form and does not change when referring to one individual or object.