An Etymological Dictionary of Astronomy and Astrophysics

1. General: The act of injecting. Something that is injected.
   

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

3. Math.: A one-to-one → mapping. In other words, a mapping from a → set A onto a set B such that for every element in B there is at the most an element in A.

See also: Verbal noun of → inject.