Noun

1. Mail that is distributed by a rapid and efficient system
2. Public transport consisting of a fast train or bus that makes only a few scheduled stops
3. Rapid transport of goods

Verb

1. Give expression to
2. Articulate; either verbally or with a cry, shout, or noise
3. Serve as a means for expressing something
4. Indicate through a symbol, formula, etc.
5. Manifest the effects of (a gene or genetic trait)
6. Obtain from a substance, as by mechanical action
7. Send by rapid transport or special messenger service

Adverb

1. By express