action of mentioning or alluding to something. provide book or article with citations of sources of information.

Powerful group who control and organize things. make or operate on with machine.

Holding the highest power, status or authority. rich cream sauce.

Evidence that helps prove something is true. To give assistance or advice to someone.

item or object. Pieces of writing about particular subjects. bind to undergo training period.

(of military vehicle or ship) covered with tough metal layer as defense against attack. To cover something in metal to protect it.

machine converting power into motion. Machines that changes energy into mechanical motion.

political, religious, or commercial assignment. Tasks given to someone to gain or achieve.

Placed or set, as a jewel set in a ring. To start (an attack) against an enemy.

maintenance of constant difference in frequency between two or more connected circuits or components. To move along a certain course.

type of aircraft which derives both lift and propulsion from one or more sets of horizontally revolving overhead rotors. Aircrafts with spinning blades at the top. To transport by helicopter.

To succeed in doing good, usually by working hard.