Etymology: Middle English treten, from Anglo-French treter, traiter, traitier, from Latin tractare to drag about, handle, deal with, frequentative of trahere to drag, pull
Date: 14th century
intransitive verb1: to discuss terms of accommodation or settlement :negotiate 2: to deal with a matter especially in writing :discourse —usually used with of<a book treating of conservation> 3: to pay another's expenses (as for a meal or drink) especially as a compliment or as an expression of regard or friendshiptransitive verb1 a: to deal with in speech or writing :expoundb: to present or represent artistically c: to deal with :handle<food is plentiful and treated with imagination — Cecil Beaton> 2 a: to bear oneself toward :use<treat a horse cruelly>b: to regard and deal with in a specified manner —usually used with as<treat the matter as confidential> 3 a: to provide with free food, drink, or entertainment <they treated us to lunch>b: to provide with enjoyment or gratification 4: to care for or deal with medically or surgically <treat a disease> 5: to act upon with some agent especially to improve or alter <treat a metal with acid>