Longman Dictionary of Contemporary English homepage

Date: 1200-1300
Language: Old French
Origin: traitier, from Latin tractare; TRACTABLE

treat

1 verb
     
treat1 S2 W1 [transitive]
1

behave towards somebody/something

[always + adverb/preposition] to behave towards someone or something in a particular way [↪ treatment]
treat somebody like/as something
She treats me like one of the family.
Penny doesn't think her co-workers treat her as an equal.
He treated his automobiles almost as tenderly as he did his wife.
badly treated/well treated
The prisoners were well treated by their guards.
treat somebody with respect/contempt/courtesy etc
Despite her seniority, Margot was never treated with much respect.
treat somebody like dirt/a dog (=treat someone unkindly and without respect)
I don't know why he stays with her - she treats him like dirt.
2

deal with something

[always + adverb/preposition] to deal with, regard, or consider something in a particular way [↪ treatment]
treat something as something
Please treat this information as completely confidential.
She treats everything I say as a joke.
treat something favourably/seriously/carefully etc
Any complaint about safety standards must be treated very seriously.
3

illness/injury

to try to cure an illness or injury by using drugs, hospital care, operations etc [↪ treatment]:
It was difficult to treat patients because of a shortage of medicine.
treat somebody with something
Nowadays, malaria can be treated with drugs.
4

buy something for somebody

to buy or do something special for someone that you know they will enjoy
treat somebody to something
We treated Mom to lunch at the Savoy.
I treated myself to a new dress.
5

protect/clean

to put a special substance on something or use a chemical process in order to protect, clean, or preserve it [↪ treatment]:
sewage treated so that it can be used as fertilizer

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