The action of counterfeiting; feigning, pretence, deceit; forgery.

The action or an act of adulterating, corrupting, contaminating, or debasing; (now esp.) the practice or process of making something poorer in…

Disingenuous alteration or perversion of something; conversion into some less genuine form; the alteration of a literary text in the course of…

The action of rendering (something) false; fraudulent alteration (of documents, of weights or measures, etc.); misrepresentation, perversion (of…

The action of counterfeiting; deceit, dissimulation, fraud, imposture.

The making of a thing in fraudulent imitation of something; also, esp. the forging, counterfeiting, or falsifying of a document. For the use in Law…

Fraud, in the legal sense; falsification of deeds or measures, coining false money, etc.

Alchemical treatment; (in quot. figurative) deceptive imitation.

= counterfeiture, n. 1a.

figurative. The (deliberate) formation of a new word, etc.; the fabrication of something specious.

The action of counterfeit, v.

The action of fake, v.2 (in various senses).

The action of counterfeiting. Obsolete. rare.

The action of falsifying, adulterating, or tampering with something. Cf. doctor, v. 2 4.