Where it sits
The original phrase sits firmly at the left; the misheard version, though common in print, sits at the right.
What it doesn't mean
Merriam-Webster says the sound-alike doesn't make it a variant. 'Intensive' means highly concentrated or exhaustive; 'intents' are purposes. It's an eggcorn: a mishearing that seems to make sense.
It comes from Tudor law. A 1546 Act of Parliament used 'to all intents, constructions, and purposes'.
What it really means
Say it fast and for all intents and purposes turns into for all intensive purposes. The two sound almost identical, which is exactly how the second one was born.
The verdict is simple. As checked in October 2026, Merriam-Webster lists for all intents and purposes, meaning "in effect" or "essentially". It does not list intensive purposes as a variant. Its usage article says the sound-alike doesn't make it legitimate. Intents are purposes. Intensive means highly concentrated or exhaustive. And what, the dictionary asks, would a highly concentrated purpose be?
That makes intensive purposes an eggcorn: a misheard phrase that seems to make its own sense, so the speaker never notices the slip. Wiktionary records it as common but still widely proscribed. It's not new. Merriam-Webster quotes "to all intensive purposes" in the Fort Wayne Daily Gazette in Indiana in May 1870.
The original is much older. According to Merriam-Webster, a 1546 Act of Parliament under Henry VIII used the phrase "to all intents, constructions, and purposes", to say the king could interpret the laws however he liked. (Wiktionary dates the act to 1547.) The phrase spread through legal and everyday writing, and "constructions" fell away.
Today there are two correct forms. To all intents and purposes is mainly British. For all intents and purposes is the American form. Both mean the same thing.
A quick memory aid: the phrase is about what something is intended for. If you can hear the intent in it, you've got it right.
Where it comes from
- 1546
An Act of Parliament under Henry VIII uses 'to all intents, constructions, and purposes' (Merriam-Webster; Wiktionary dates the act to 1547).
- Later
The phrase spreads through legal and other writing as 'to all intents' and 'to all intents and purposes', dropping 'constructions'.
- May 1870
One of the earliest recorded 'to all intensive purposes', in the Fort Wayne Daily Gazette, Indiana (Merriam-Webster).
- Today
'To all intents and purposes' survives chiefly in British English; 'for all intents and purposes' is the American form.
In real life
- The shop hasn't officially closed, but with no stock and no staff it is, for all intents and purposes, gone.
- Her name is on the lease, but for all intents and purposes it's her brother's flat.
- To all intents and purposes the match was over at half-time — four goals down and a man sent off.
Questions
Q01Is it 'for all intents and purposes' or 'for all intensive purposes'?
For all intents and purposes. Merriam-Webster says 'for all intensive purposes' is not a legitimate variant: it is an eggcorn, a mishearing that seems logical. British English often uses 'to all intents and purposes', which is also correct.
Q02What does 'for all intents and purposes' mean?
In effect, essentially, in every practical sense. You use it when something isn't technically true but works out the same: 'the deal is, for all intents and purposes, done'.
Q03Where does the phrase come from?
From English law. According to Merriam-Webster, a 1546 Act of Parliament under Henry VIII used 'to all intents, constructions, and purposes'. The 'constructions' was later dropped.
Q04How old is 'for all intensive purposes'?
Older than you might think. Merriam-Webster quotes 'to all intensive purposes' in an Indiana newspaper, the Fort Wayne Daily Gazette, in May 1870.
Sources
- 'For All Intensive Purposes' or 'For All Intents and Purposes' — Merriam-Webster.
- for all intents and purposes — Merriam-Webster (idiom entry).
- for all intents and purposes — Wiktionary (etymology).
- for all intensive purposes — Wiktionary (usage notes).