number expressing the central or typical value in a set of data. Total of numbers divided by the number of items. amount to or achieve as average rate or amount over period of time.

business relations or transactions. To do business with someone or to sell products.

person who teaches. People who teaches others, especially in a school.

To make contact with the ball in a game or sport.

used for emphasis with following adjective functioning as adverb. thing that is unspecified or unknown.

Circumstance or condition surrounding an event.

precious stone. Very hard colorless stones used in jewelry.

assembled or made from whatever is available, and so unlikely to be of highest quality. mark or wound made by scratching. To rub your skin with your nails to stop an itch.

set of related web pages located under single domain name. Collections of webpages in one location.

become fully aware of something as fact.

Referring to any particular kind, type, quantity. at all. Anything or everything needed; no matter what. said as response indicating reluctance to discuss something, often implying indifference. used for emphasis instead of 'what' in questions.

Ideas of a particular group. To have an idea about something without certainty.

Academic field studying the practice of teaching.

Used to add new (often different) information.