A book containing facts about a particular subject that is used by people studying that subject.

A folder, box, etc, used to keep documents or other items in order.

The exchange of messages in an internet or other network.

It is the set of keys that you press in order to operate a computer, tablet, or some phones.

An institution where students study for degrees and where academic research is done.

Someone who trains a person or team of people in a particular sport.

A book which has a separate space for each day of the year. You use a diary to write down things you plan to do, or to record what happens in your life day by day.

An announcement online, or in a newspaper, on television, or on a poster about something such as a product, event, or job.

Science which is concerned with the study of living things.

A series of lectures on a particular subject.

To have a fact, a piece of information, or an answer, correctly in your mind.