to put (thought) into words; utter or state

to express an idea clearly.

to show, manifest, or reveal

to express one's anger.

to set forth the opinions, feelings, etc., of (oneself), as in speaking, writing, or painting

He can express himself eloquently.

to represent by a symbol, character, figure, or formula

to express water as H 2 O; to express unknown quantities algebraically.

to send by express

to express a package or merchandise.

to press or squeeze out

to express the juice of grapes.

to exude or emit (a liquid, odor, etc.), as if under pressure

The roses expressed a sweet perfume.

Genetics . (of a gene) to be active in the production of (a protein or a phenotype).

clearly indicated; distinctly stated; definite; explicit; plain

He defied my express command.

special; definite

We have an express purpose in being here.

direct or fast, esp. making few or no intermediate stops

an express train; an express elevator.

used for direct or high-speed travel

an express highway.

duly or exactly formed or represented

an express image.

pertaining to an express

an express agency.

an express train, bus, elevator, etc.

a system or method of sending freight, parcels, money, etc., that is faster and safer, but more expensive, than ordinary freight service

We agree to send the package by express.

a company engaged in this business.

British . a messenger or a message specially sent.

something sent by express.

by express

to travel express.

Obsolete . expressly.