The process of placing a spacecraft into a specific trajectory, such as an earth orbit or an encounter trajectory to Mars. Also known as insertion.

1. The method of applying a signal to an electronic circuit or device.

2. The process of introducing electrons or holes into a semiconductor so that their total number exceeds the number present at thermal equilibrium.

1. Also known as intrusion; sedimentary injection.

2. A process by which sedimentary material is forced under abnormal pressure into a preexisting rock or deposit.

3. A structure formed by an injection process.

A mapping f from a set A into a set B which has the property that for any element b of B there is at most one element a of A for which f (a ) = b. Also known as injective mapping; one-to-one mapping; univalent function.

The introduction of fuel, fuel and air, fuel and oxidizer, water, or other substance into an engine induction system or combustion chamber.

1. Introduction of a fluid into the skin, vessels, muscle, subcutaneous tissue, or any cavity of the body.

2. The substance injected.

The introduction under pressure of a liquid or plastic material into cracks, cavities, or pores in a rock formation.