What is the longest word but the shortest?

Answer 1

The shortest word is 'a' or 'I'.

The longest non-technical word is floccinaucinihilipilification. In use since about 1741, it means "the action or habit of estimating something as worthless". It is actually a combination of four Latin words, flocci, nauci, nihili, pilifi, all of which signify "at a small price" or "for nothing".

The longest word (though a technical medical term) that is listed in any of the main English langaugae dictionaries is pneumonoultramicroscopicsilicovolcano-

coniosis

(It is one word, but the answer box will not accept it in its entirety)

This was originally a hoax word that came to define a genuinely accepted disease caused by inhaling fine silica particles expelled by a volcano.

Other contenders for the title include:

Antidisestablishmentarianism (28) (Non-coined, Non-technical, In a major dictionary)

Methionylthreonylthreonylglutaminylarginyl...isoleucine(189,819)

(Non-coined, Technical, Not in a major dictionary, disputed)

Answer 2

Perhaps "abbreviated."