1. For that, or this, or it.

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

• thereoy,
• stherefore,
• therfor,
• thereforce,
• therfefore,
• therefopre,
• thjerefore,
• thereford,
• thereforec,
• thereofore,
• therefre,
• thereafer,
• threfore,
• thererfore,
• theirfor,
• therefroe,
• therefter,
• therrfore,
• therofore,
• thierfor

• therefrom,
• thurifer,
• therefore,
• thurber,
• three-party.

The adjective form of "therefor" is "therefore".

The plural form of "therefor" is "therefors".

The singular form of the word "therefor" is "therefore"