sesquipedality

/ˌsɛskwɪpɪˈdæləti/
noun
  1. The quality or habit of using very long words, especially in a way that seems unnecessary or showy.
    • His writing is full of sesquipedality, making simple ideas sound complicated.
    • Some people admire sesquipedality in poetry, while others find it pretentious.
    • The professor's sesquipedality often confused his students, who wished he would use shorter words.
  2. A very long word itself.
    • The word 'antidisestablishmentarianism' is a famous example of sesquipedality.
    • The dictionary entry listed several sesquipedalities that most people never use in conversation.
    • She enjoyed collecting sesquipedalities and using them in crossword puzzles.