Study of the physical world, based on facts.

set or category. Ranks or levels in society ranked from high to low. To place things into groups by common qualities.

Long hole dug in the ground, e.g. to move water. To dig a long hole for carrying water.

begin or be reckoned from particular point in time or space.

To exchange one kind of money for another.

character representing speech sound. Messages you put in an envelope and send by post. inscribe letters on.

Act of getting knowledge. To get knowledge or skills by study or experience.

The starting of a process.

(of shooting) carried out to protect exposed person from enemy. thing used to protect, decorate, or conceal something else. To travel a certain distance in a given time.

To regularly pay to receive a service.

branch of mathematics dealing with relations of sides and angles of triangles and with relevant functions of any angles.

set to value or put in condition appropriate to start of operation.

Many of. more than two but not many. More than two but not a large amount.

A thing or issue that people do not agree about. alter coat of arms.

Being what was wanted or needed. used to greet someone in polite or friendly way. instance or manner of greeting someone. To greet someone who has just arrived.