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If you press this button, the machine starts.

If you see him, give him this letter.

If your feet were smaller, you could wear my shoes.

If I had a million dollars, I would buy a big house.

may see you tomorrow. If not, I'll see you next week.

a word that shows a question Do you know if Paul is home?

She asked me if I wanted to go to a party.

—SYNONYM whether

every time

If I forget to bring my lunch, I can buy it at the cafeteria. —SYNONYM whenever as if

in a way that makes you think something

She looks as if she didn't get enough sleep last night.

if I were you

words that you use when you are giving someone advice If I were you, I would leave now.

if only

words that show that you want something very much If only I could drive!

ig • loo / ' iglu/ noun [ count ] ( plural ig - loos ) a small house that is made out of blocks of snow

ig • nite / ig ' nait / verb ( ig nites , ig - nit - ing , ig nit - ed )

( formal )

to start burning or to make something start burning The gas ignited and caused an explosion.

ig • ni • tion / ig' nijn / noun [ count ]

the part of a car where you put the key to start the engine I left my key in the ignition.

ig • no • rance awl / ' ignarans / noun

[noncount]

not knowing about something Her ignorance surprised me.

ig • no • rant AWL / ' ignarant / adjective

not knowing about something I'm very ignorant about computers.

ig . nore О / igw / verb

( ig - nores , ig - nor - ing , ig nored )

to know about someone or something, but to not do anything about it

He completely ignored his doctor's advice. I said "hello" to her, but she ignored me. Prefix

il-

( used with words beginning with "l" ) not; the opposite of il legal il legally il literate il literacy

ill / il / adjective ( health ) not well; not in good health He is seriously ill.

a mentally ill patient —SYNONYM sick The noun is illness .

I'll / ail /

short for I will ^^^

il • le • gal Ф AWL / i 'ligl / adjective

not allowed by law

It's illegal to drive through a red light. —ANTONYM legal

il • le • gal • lyAWL / i ' ligali / adverb She entered the country illegally.

il • leg • i • ble / i ' led₃abl / adjective

difficult or impossible to read

Your handwriting is completely illegible.

—ANTONYM legible

il • lit • er • ate / i ' litarat / adjective

not able to read or write —ANTONYM literate

il • lit • er • a • cy / i 'litarasi / noun [ noncount ] the problem of adult illiteracy —ANTONYM literacy

ill . n6SS Ф / 'ilnss / noun ( plural ill ness . es ) ( health )

1 [ noncount ] being sick

missed a lot of school because of illness last year.

[ count ] a type or period of illness She died after a long illness. Collocations

Illness getting sick catch a cold/the flu/a virus/a bug get sick/a cold/a headache have a cold/an infection/a fever/a toothache feel sick/hot/dizzy treatment examine a patient be on medication/antibiotics get/have a shot/an injection/an X-ray need/receive/get treatment — Look at the note at injury .

il • log • i • cal aw / i ' lad3ikl /

not sensible or reasonable

I know you feel strongly about this, but your argument is illogical.

—ANTONYM logical

il • lu • sion / i lu3n / noun 1 [ count, noncount ] a false idea or belief

have no illusions about the situation — I know it's serious.

[ count ] something that your eyes tell you is there or is true but in fact is not