Measure the distance along each side of the oven - from the top to bottom edge of the cabinet cutout. Note the measurements on the reference sheet. If you can, measure depth of the cabinet cutout from the front edge to the back wall.
Antidisestablishmentarianism is a splendid example of a word that people enjoy for some reason other than its ostensibly intended use; they like it because it is a very long word. Merriam-Webster does not define the word, on the grounds that very few people (if any) ever use it, except as an example of a long word.
The noun floccinaucinihilipilification occurs, but NOT the verb. EDIT for JENNYJEN: Antidisestablishmentarianism is not a verb and it is not American, it is British. EDIT: Length is not a measurement that is relevant to dictionary makers, so you won't find lists of longest verbs, etc. Most of the longest words in English (whether artificial, British, or American) are nouns or adjectives, therefore longest word lists end long before they reach the real verbs of the language. Verbs are the workhorses of language and so the longer a verb is the more likely it is never to be used.