I can not tell you how many times I have come across today's word in my lifetime! No, really I can't, I have no frigging idea (it has been a few, a whole bunch at least?) I don't know why, but a picture of Alex Trebek with a flashing 'Spelling Bee' sign behind him, is in my mind.

Fortunately I came across the answer(and spelling of it), in the first sentence, after googling it.

Antidisestablishmentarianism is an outdated political ideology based on the idea that the United Kingdom should not abandon the Church of England as its formal state religion. Those who opposed the concept of state religion wanted to disestablish, and so those who opposed them were antidisestablishmentarians.

This one makes me long for the good old days, of simple, one (1) syllable words.

1 One Syllable Words | Monosyllabic Words

and that nostalgic song,

Mary Hopkin "Those Were The Days" on The Ed Sullivan Show - YouTube

I love this word. 

....from Wiki:    "The word antidisestablishmentarianism, with 28 letters and 12 syllables (an-ti-dis-es-tab-lish-ment-ar-i-an-is-m), is one the longest words in the English language. It is estimated to be the 6th longest word in the Oxford dictionary.^[7] However, the word is not recorded in Merriam-Webster's dictionary of American English.^[8]"

Merriam Webster's having a hissy fit with the word:

In fact, antidisestablishmentarianism isn't entered in any of our dictionaries. Yes, we know: we enter acrylonitrile-butadiene-styrene and don't enter antidisestablishmentarianism? What kind of lexicographers are we?

We are the kind that like to enter words with meanings. There are three criteria all words must meet in order to be entered into the dictionary: widespread usage, sustained usage, and meaningful usage—that is, evidence that the word is used to refer to something.

Where antidisestablishmentarianism gets disqualified first is the "meaningful usage" criterion. Go ahead: what does "antidisestablishmentarianism" mean? It's an example of a long word, but that's not its meaning. A word with meaning contributes essential information to a clause or sentence. When antidisestablishmentarianism is used as an example of a long word, it doesn't have a meaning at all.

But can't we construct a meaning for it? Sure. Based on its component parts, antidisestablishmentarianism would mean something like, "opposition to depriving a legally established state church of its status." Our problem is that we have scant evidence of it being used with that meaning. In our files, which go back over 100 years, we only have three citations for antidisestablishmentarianism used with something like that meaning. Three citations do not constitute "sustained" or "widespread" use.

You could make a case that we should enter antidisestablishmentarianism simply because it's a well-known word. With more widespread, sustained, meaningful use, we will—and then it will still not be the longest word in the Merriam-Webster.com dictionary. Because, at 28 letters, antidisestablishmentarianism is two letters short of beating the 29 letters in acrylonitrile-butadiene-styrene.

Of course, they'll both fall short of the "longest word" title if we enter supercalifragilisticexpialidocious.

So, in other words, Merriam-Webster abhors long words. I wonder what they mean with:

Our problem is that we have scant evidence of it being used with that meaning. In our files, which go back over 100 years, we only have three citations for antidisestablishmentarianism used with something like that meaning. Three citations do not constitute "sustained" or "widespread" use.

Does this mean that the 100 years of evidence is actually found in the Library of Alexandria?

Is Merriam-Webster a secret sect of grammar nazis?

By coincidence antidisestablishmentarianism is one of the long words discussed on a recent episode of a YouTube channel called Words Unraveled which I would highly recommend to anyone interested words and especially the quirkiness of words.

The discussion about antidisestablishmentarianism starts at 11 minutes and includes an entertaining and fascinating explanation of why the word is so well known in USA. Enjoy.

The link is

I not can even say that word.