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to be in something such as a play or a concert The band has never performed here before.

The play will be performed every night next week.

per • form .аПСе © / por'formons / noun

[ count ] a time when a play, etc. is shown, or music is played in front of a lot of people

We went to the evening performance of the play.

[ noncount ] how well you do something

My parents were pleased with my performance on the exam.

per • form • er / par formar / noun [ count ]

a person who is in something such as a play or a concert

per • fume / par fyum / noun [ count, noncount ]

a liquid with a nice smell that you put on your body a bottle of perfume

a nice smell

per.haps © / par hreps / adverb

( formal )

a word that you use when you are not sure about something I don't know where she is — perhaps she's still at work. There were three men, or perhaps four.

—SYNONYM maybe

pe • rim • e • ter / pa 'rimatar / noun [ count ]

the outside edge or limit of an area of land the perimeter fence of an army camp

( MATH ) a measurement of the distance around an area or shape

What is the perimeter of the triangle?

pe .ri .od © J Щ / ' piriad / noun [ count ]

an amount of time

This is a difficult period for him. What period of history are you studying?

one of the equal lengths of time that make a school day I have German during second period.

( HEALTH ) the time when a woman loses blood from her body each month

( ENGLISH LANGUAGE ARTS ) a mark ( . ) that you use in

writing to show the end of a sentence, or after the short form of a word

the pe • ri • od • ic ta • ble / da piriadik

' teibl/ noun [ singular ]

( CHEMISTRY ) a list of all the chemical substances (called elements )

perm / parm / noun [count ]

the treatment of hair with special chemicals to make it curly I think I'm going to get a perm .

perm verb ( perms , perm - ing , permed )

She had her hair permed .

per .ma .nent © / parmanant / adjective

continuing forever or for a very long time without changing I'm looking for a permanent job.

—Look at temporary .

per • ma • nent • ly / ' parmanantli / adverb Has he left permanently?

per .mis .sion ©/par'mijh/noun

[noncount]

allowing someone to do something

She gave me permission to leave early.

You may not leave the school without permission .

per • mit 1 / psr ' mit / verb ( per • mits , per mit • ting , per mit ted )

( formal )

to let someone do something

You are not permitted to smoke in the hospital.

—SYNONYM allow

per • mit2 / ' psrmit / noun [ count ]

a piece of paper that says you can do something or go somewhere

Do you have a work permit ?

per • pen • dic • u • lar / ,psrpsn dikyslsr /

adjective

( MATH ) If two lines are perpendicular , one of the lines

makes an angle of 90° with the other

Are these lines perpendicular to each other?

per • se • cute / ' psrsskyut / verb ( per•se•cutes,per se cut• ing , per • se • cut•ed )

to treat someone in a cruel and unfair way, especially because of their race or beliefs ► per • se • cu • tion / ,psrss ' kyujn / noun [ count, noncount ]

the persecution of minority groups

per • se • vere / ,psrss ' vir / verb

( per • se • veres , per • se • ver • ing , per • se • vered )

to continue trying to do something that is difficult If you persevere with your studies, you'll get a good job.

per • sist • ent AWL| / psr' sistsnt / adjective

determined to continue doing something, even though people tell you to stop