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( health ) a person who has been very sick for a long time and needs another person to take care of them

in • val • u • a • ble / in ' vrelyabl /

very useful: Your help was invaluable. Which word?

Be careful! Invaluable is not the opposite of valuable . The opposite of valuable is worthless .

in • var • i • a • bly aw / in ' veriabli /

always or almost always He invariably arrives late.

in • va • sion / in'vei3n / noun [count, noncount] a time when an army from one country goes into another country to attack it The verb is invade .

in .Vent О / in'vent/ verb ( in vents , in - vent - ing , in - vent ed )

to make or think of something for the first time Who invented the bicycle?

to say something that is not true

I realized that he had invented the whole story.

in • ven • tor / in 'ventar / noun [ count ] Marconi was the inventor of the radio.

in • ven • tion / in 'venjn / noun

[ count ] a thing that someone has made for the first time

[ noncount ] inventing something

The invention of the telephone changed the world.

in • ver • te • brate / in 'vartabrat / [count]

( biology ) any animal without a solid line of bones (a backbone ) going along its body

worms and other invertebrates —ANTONYM vertebrate

i n • vest AWL| / in ' vest / verb ( in vests ,in - vest - ing , in - vest - ed )

( business ) to give money to a business or bank so that you

will get more money back

He invested all his money in the company.

in • vest • ment AWL| / in 'vestmant / noun [ count, noncount ]

an investment of $10,000

in • ves • tor AWL / in ' vestar / noun [ count ]

She was looking for investors for her new company.

in • ves • ti • gate © Awl / in ' vestageit / verb

( in ves - ti - gates , in - ves ti - gat - ing , in - ves - ti - gat ed )

to try to find out about something The police are investigating the murder.

in • ves • ti • ga • tion AWL / investa ' geijn / noun

[ count, noncount ]

The company is under investigation for fraud.

in • vis • i • ble aw / in ' vizabl /

If something is invisible , you cannot see it Wind is invisible. —ANTONYM visible

in .vi .ta .tion © / ^nva'teijn/noun[ count]

If you have an invitation to go somewhere, someone has spoken or written to you and asked you to go Joe sent me an invitation to his birthday party.

in .vite Ф / in'vait / verb ( in vites , in - vit ing , in - vit - ed )

to ask someone to come to a party, to your house, etc. Anna invited me to her party. Let's invite them over for dinner.

in • voice / ' invois / noun [ count ]

( business ) a list that shows how much you must pay for things that someone has sold you, or for work that someone has done for you

in • vol • un • tar • y / in 'valanteri /

done without wanting or meaning to an involuntary gasp of pain

in .volve О E / in ' valv /

( in volves , in - volv - ing , in - volved )

1 to have something as a part The job involves using a computer.

2 If you involve someone in something, you make them take part in it

I want to involve more people in the concert.

in • volved aw / in ' valvd / Я

taking part in something; being part of something or

connected with something

I'm very involved in local politics.

We need to interview the people involved.

in • ward / inward / ( also in - wards / inwardz / ) adverb

toward the inside or center The doors open inward.