To entertain with food or drink, especially the latter, as a compliment, or as an expression of friendship or regard; as, to treat the whole company.

To give a gratuitous entertainment, esp. of food or drink, as a compliment.

An entertainment given as an expression of regard.

That which affords entertainment; a gratification; a satisfaction; as, the concert was a rich treat.

To handle; to manage; to use; to bear one's self toward; as, to treat prisoners cruelly; to treat children kindly.

To discourse on; to handle in a particular manner, in writing or speaking; as, to treat a subject diffusely.

To subject to some action; to apply something to; as, to treat a substance with sulphuric acid.

To discourse; to handle a subject in writing or speaking; to make discussion; -- usually with of; as, Cicero treats of old age and of duties.

To negotiate; to settle; to make terms for.

To negotiate; to come to terms of accommodation; -- often followed by with; as, envoys were appointed to treat with France.

engage in negotiations in order to reach an agreement; "they had to treat with the King"

To care for medicinally or surgically; to manage in the use of remedies or appliances; as, to treat a disease, a wound, or a patient.

subject to a process or treatment, with the aim of readying for some purpose, improving, or remedying a condition; "process cheese"; "process hair"; "treat the water so it can be drunk"; "treat the lawn with chemicals" ; "treat an oil spill"

To care for a patient with a disease by using medicine, surgery, or other approaches.