number expressing the central or typical value in a set of data. Total of numbers divided by the number of items. To add numbers then divide by the number of items.

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 move your hand, a bat, etc. against with force.

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. score or mark surface of something with sharp or pointed object.

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

To become aware of or understand mentally.

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 to emphasize lack of restriction.

idea or opinion produced by thinking, or occurring suddenly in mind. To have an idea, opinion or belief about something.

Academic field studying the practice of teaching.

Used to add new (often different) information.