forth
Henceforth is an adverb meaning “from this time forward; from now on.” It is used to indicate that something will take effect immediately and continue into the future. It is often used in legal documents and contracts to signify that a particular clause or provision is now in effect and will remain in effect.
For example, a contract might state: “The terms of this contract shall be binding henceforth.” This means that the terms of the contract are now in effect and will remain in effect until the contract is terminated.
Henceforth can also be used to refer to something that has just happened or has been decided. For example, a person might say “Henceforth, I will no longer tolerate your disrespect.” This means that the person has just decided that they will no longer tolerate the other person’s disrespect and that this decision will remain in effect from this point forward.
Henceforth is derived from the Old English phrase “hence forth” which literally means “from this time forward.” It has been in use since the 14th century and is still used in modern English.