i Register
In some senses, e- is marked as idiomatic. Watch for register when choosing this word.
prefix
Used to form adjectives with the sense of something being absent, being removed, or moving outward.
e.g. eluviation, edentulous, elenge
prefix
In an electronic form, especially computerized and digital; often in association with the Internet.
prefix
For emergency purposes.
e-stop, e-brake