Reform means beneficial change, or sometimes, more specifically, reversion to a pure original state.

Reform is generally distinguished from revolution. The latter means basic or radical change; whereas reform may be no more than fine tuning, or at most redressing serious wrongs without altering the fundamentals of the system. Reform seeks to improve the system as it stands, never to overthrow it wholesale.

During the Philadelphia Convention of 1787, for example, the New Jersey Plan would have reformed the existing constitution, the Articles of Confederation. By contrast, the Virginia Plan proposed to completely rewrite the nation's fundamental charter, and create a new constitution. Virginia's more revolutionary approach prevailed and resulted in the U.S. Constitution.

Likewise today, many reforms are proposed in the United States Congress which aim to improve the system. For example, campaign finance reform would modify the way elections in the United States are financed, but would not change the basic nature of the offices at stake. Rotation in office or term limits would, by contrast, be more revolutionary, in altering basic political connections between incumbents and constituents.

The UK government frequently uses the term "reform" to describe changes to public services, such as the National Health Service. However, these changes are not universally accepted as beneficial .

Re-form

A note about grammar: when used to describe something which is physically formed again, such as re-casting it in a mold/mould, or a band that gets back together, the proper term is re-form (with a hyphen), not "reform".