A more thorough explanation:

Definition: Instar (in-stahr) is a Latin term that means "likeness" or "equivalent of a thing".

Example: The phrase "instar omnium" means "equivalent or tantamount to all".

Explanation: The term instar is often used in historical contexts to describe something that is equivalent to or similar to something else. In the example given, "instar omnium" means that something is equivalent to all other things. This term can be used to compare things that are similar in nature or to describe something that is a close match to something else.