[*Anya*]

Origin

When researching the development of a phrase it is usually the origin that is difficult to determine; the spelling and the meaning are generally pretty well established. With 'for (or to) all intents and purposes' it is the other way about. The origin is unambiguous, as the first recorded use was in an Act of Parliament under Henry VIII, in 1546:

"to all intents, constructions, and purposes"

Henry didn't shilly-shally when it came to the law of England. In 1539, he had Parliament pass the Statute of Proclamations, which gave him power to legislate by proclamation. In effect, from that date, the law was 'to all intents and purposes' whatever Henry VIII said it was. He made good use of this freedom; as well as executing a brace of wives, many others with whom Henry didn't see eye to eye were hanged, beheaded, burned or boiled, often for quite minor offences.

The meaning of 'to all intents and purposes' is less clear. 'Intents' and 'purposes' are words that we aren't likely to come across very often in the 21st century, outside of legal documents. The phrase, like many a legal phrase before and since, is rather obtuse and difficult to decipher. What is meant when a thing is said to be true 'for all intents and purposes' is 'it isn't actually true but it it so close to being so that we may proceed as though it is'. An example may help:

Isaac Newton's Laws of Motion aren't 100% precise in describing the motion of objects that approach the speed of light. However, for a man on a horse who measures time by a pocket watch, they are, for all intents and purposes, accurate.

http://www.phrases.org.uk/meanings/a...-purposes.html