I

If you do something or if something happens inside (of) a particular time or limit, you do it or it happens in less than that amount of time or under the limit:

adjective [ before noun ]

(of information) obtained by someone in a group, organization, or company and therefore involving special or secret knowledge:

insomnia

noun [ U ]

the condition of being unable to sleep, over a period of time:

inspiration

noun

[ C ] a sudden good idea:

[ S ] someone that people admire and want to be like:

instinct

noun [ C or U ]

the way people or animals naturally react or behave, without having to think or learn about it:

institution

noun

[ C ] a custom or tradition that has existed for a long time and is accepted as an important part of a particular society:

instruct

verb

[ T ] to teach someone how to do something:

instruction

noun

ORDER

[ C usually plural ] something that someone tells you to do:

TEACHING

[ U ] the teaching of a particular skill or subject:

instrument

noun [ C ]

formal a way of achieving or causing something:

intact

adjective

complete and in the original state:

not damaged:

integrity

noun [ U ]

approving the quality of being honest and having strong moral principles that you refuse to change:

intellect

noun

[ U ] the ability to understand and to think in an intelligent way:

intellectual

noun [ C ]

a very educated person whose interests are studying and other activities that involve careful thinking and mental effort:

intellectually

adverb

in a way that relates to your ability to think and understand things, especially complicated ideas :

intense

adjective

Intense people are very serious, and usually have strong emotions or opinions:

intensely

adverb

extremely or strongly:

in a very serious way that shows strong emotions or opinions:

intensify

verb [ I or T ]

to become greater, more serious, or more extreme, or to make something do this:

intent

noun [ U ] formal or specialized

the fact that you want and plan to do something:

be intent on sth/doing sth

to be determined to do or achieve something:

a conflict of interest

a situation in which someone cannot make a fair decision because they will be affected by the result:

interference

noun [ U ]

noise or other electronic signals that stop you from getting good pictures or sound on a television or radio

interim

adjective [ before noun ]

temporary and intended to be used or accepted until something permanent exists:

interpretation

noun [ C or U ]

EXPLANATION

an explanation or opinion of what something means:

WAY OF PERFORMING

a particular way of performing a piece of music, a part in a play, etc.:

interval

noun [ C ]

a period between two events or times:

We see each other at regular intervals – usually about once a month.

the space between two points:

intervene

verb [ I ]

to intentionally become involved in a difficult situation in order to improve it or prevent it from getting worse:

intervention

noun [ C or U ]

action taken to intentionally become involved in a difficult situation in order to improve it or prevent it from getting worse:

intimate

adjective

PERSONAL

having, or being likely to cause, a very close friendship or personal or sexual relationship:

intimate relationships
They shared an intimate physical experience.
The diary revealed several intimate details about his private life.
He’s become very intimate with an actress.
The restaurant has a very intimate atmosphere.
They had dinner in the very intimate surroundings of a local restaurant.

EXPERT

(of knowledge or understanding) detailed, and obtained from a lot of studying or experience:

She has an intimate knowledge of Tuscany, where she has lived for 20 years.

into the bargain

us also in the bargain

in addition to other facts previously mentioned:

intolerable

adjective

too bad or unpleasant to deal with or accept:

intolerance

noun

[ U ] the fact of refusing to accept ideas, beliefs, or behaviour that are different from your own:

intolerant

adjective disapproving

disapproving of or refusing to accept ideas or ways of behaving that are different from your own:

intriguing

adjective

very interesting because of being unusual or mysterious:

intrinsic

adjective

being an extremely important and basic characteristic of a person or thing:

introduce

verb [ T ]

to speak or write before the beginning of a performance, programme or book and give information about it; to tell an audience about the person who is going to speak, sing, etc. :

introvert

noun [ C ]

someone who is shy, quiet, and prefers to spend time alone rather than often being with other people

intrude

verb [ I ]

to go into a place or situation in which you are not wanted or not expected to be:

intruder

noun [ C ]

someone who is in a place or situation where they are not wanted:

someone who enters a place without permission in order to commit a crime:

intrusion

noun [ C or U ]

an occasion when someone goes into a place or situation where they are not wanted or expected to be:

intuition

noun [ C or U ]

(knowledge from) an ability to understand or know something immediately based on your feelings rather than facts:

invade

verb

[ T ] to spoil a situation or quality for another person without thinking about their feelings:

invariably

adverb

always:

invasion

noun [ C or U ]

an occasion when a large number of people or things come to a place in an annoying and unwanted way:

an action or process that affects someone’s life in an unpleasant and unwanted way:

OPPOSITE RESULT

a situation in which something which was intended to have a particular result has the opposite or a very different result:

TYPE OF SPEECH

the use of words that are the opposite of what you mean, as a way of being funny: