1580s, "action of remonstrating in a friendly manner;" 1590s, "argumentative protest," from Latin expostulationem (nominative expostulatio) "a pressing demand, complaint," noun of action from past-participle stem of expostulare "demand urgently," from ex "from" (see ex-) + postulare "to demand" (see postulate (v.)).
export
expose
exposition
expository
expostulate
expostulation
exposure
expound
express
expression
expressionist