thing that is required as prior condition for something else to happen or exist. Necessary previous condition, thing, or action.

set or category. Groups that share some things in common. To place things into groups by common qualities.

systematic investigation into and study of materials and sources. investigate systematically.

A plan to do something at a certain time. To plan to do something at a certain time.

continuing or valid to final destination. expressing movement into one side and out of other side of opening etc.. Over, in, across an entire thing or place.

To finish or reach the end of doing something.

bring into existence.

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

official list or record of names or items. To record your name on an official list; sign up.

To control exactly how something will be or act.

consequence, effect, or outcome of something. Some things produced through tests or experiments. occur or follow as consequence of something.

To choose a suitable thing from a group.

containing as part of whole being considered. To make someone, something part of a group.

route or direction. A series of lessons given over time. To flow somewhere rapidly and in great quantity.

more distant in space. A greater distance; at a more distant point. (Used to introduce an additional point); also. To help to happen or develop; promote.