activity natural to or purpose of person or thing. Social events or parties, such as weddings. To serve a certain purpose or role.

something difficult to understand or explain. Books, plays, or films about solving a strange crime.

comprise or contain as part of whole.

organized group of people.

officially compulsory, or otherwise considered essential. To demand that someone does something.

all existing matter and space considered as whole.

most important. guidance. To be at the front of a race or game.

To know the meaning of language, what someone says.

Creating interest, happiness or pleasurable fear. To cause a reaction; make active.

Concerning one particular thing or kind of thing. medicine or remedy effective in treating particular disease.

action of staying where one is or delaying action until particular time or event. To remain in a place until a thing happens.

conclusion that can be drawn from something although it is not explicitly stated. Possible effects, results from an action or event.

Work done to find or discover knowledge. To study in order to discover new ideas and facts.

To move from one country or place to live or work.