of all meaning
EN- AdverbSUF-all
- Used as an intensifier with superlative forms of adjectives.
- Best of all was the bicycle I got.   First of all, I'd like to thank my agent.   He was the greatest playwright of all.
- Used as an intensifier with nouns to denote being ultimate.
- Of all the queer collections of humans outside of a crazy asylum, it seemed to me this sanitarium was the cup winner. […] When you're well enough off so's you don't have to fret about anything but your heft or your diseases you begin to get queer, I suppose.
- Used as an intensifier with superlative forms of adjectives.
- More Examples
- Used in the Middle of Sentence
- The English, of all classes, value themselves on this trait, as distinguishing them from the French, who, in the popular belief, are more polite than true.
- On behalf of all those present, may I thank you for a well executed presentation.
- Makes me wish I had a VCR so I could blow the dust off of all my video tapes and have a Who-athon.
- Used in the Beginning of Sentence
- Of all the problems which lie on the borderline of philosophy and science, perhaps none has caused more spilled ink, more controversy, and more emotion than "the problem of the direction of time.
- Of all the things that attracted her to the park, the timelessness of the ever-flowing river was most pleasing.
- Of all the inventors to obtain patents, only a few have really built a better mousetrap.
- Used in the Ending of Sentence
- He is at most a confus'd and wild Christian, not specializ'd, by any forme, but capable of all.
- Used in the Middle of Sentence
Definition of of all in English Dictionary
- Part-of-Speech Hierarchy
- Phrases
- Prepositional phrases
- Prepositional phrases
- Adverbs
- Prepositions
- Prepositional phrases
- Prepositional phrases
- Phrases
Source: Wiktionary
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Grammatically, this idiom "of all" is a phrase, more specifically, a prepositional phrase. It's also an adverb. It's also a preposition, more specifically, a prepositional phrase.