property of being efficient.

testing one's abilities. To formally invite someone to compete at something.

Activity or subject one enjoys doing or learning. To persuade to do, become involved with something.

group of people with common characteristic.

with complete sincerity and commitment.

needing much effort or skill to accomplish, deal with, or understand.

of or producing electricity. electric train.

Main; central; basic; most important. Fundamental/central idea, point of a speech, etc..

Being very excited and interested in something. To feel sudden excitement or pleasure.

designed for people to live in.

sad or displeased because person or thing has failed to fulfil one's hopes or expectations. To not meet the expectations of others or yourself.

Being what was wanted or needed. used to greet someone in polite or friendly way. instance or manner of greeting someone. To accept or receive something happily and gladly.

group of parents and their children. Groups of people who are related through blood.

able to be maintained at certain rate or level.

Completely; totally; very.