expatiate

 
Pronunciation: /ɪkˈspeɪʃɪeɪt, ɛk-/

verb

[no object] (expatiate on)
  • speak or write in detail about: she expatiated on working-class novelists

Derivatives

expatiation

Pronunciation: /-ˈeɪʃ(ə)n/
noun

Origin:

mid 16th century (in the sense 'roam freely'): from Latin exspatiari 'move beyond one's usual bounds', from ex- 'out, from' + spatiari 'to walk' (from spatium 'space')