Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Latin
Origin: , past participle of inficere 'to dip in, stain'

infect

verb
     
in‧fect [transitive]
1MI to give someone a disease:
People with the virus may feel perfectly well, but they can still infect others.
infect with
the number of people infected with HIV
2MI [usually passive] to make something contain something harmful that gives people a disease
infect with
Eggs known to be infected with salmonella were allowed to go on sale.
3MI if a feeling or interest that you have infects other people, it makes them begin to feel the same way or have the same interest:
Lucy's enthusiasm soon infected the rest of the class.
4TD if a virus infects your computer or disks, it changes or destroys the information in them

Dictionary pictures of the day
Do you know what each of these is called?
What is the word for picture 1? What is the word for picture 2? What is the word for picture 3? What is the word for picture 4?
Click on any of the pictures above to find out what it is called.

Explore our topic dictionary