Antidisestablishmentarianism
Antidisestablishmentarianism is one of the longest words in the English language. It has 28 letters and 12 syllables. It is considered to be the longest word, if you do not count technical terms. For example, "pneumonoultramicroscopicsilicovolcanoconiosis" is a technical term for a lung disease made by people who wanted it to be the longest word.