Quick definitions from WordNet (express)

▸ noun:  rapid transport of goods
▸ noun:  public transport consisting of a fast train or bus that makes a limited number of scheduled stops ("He caught the express to New York")
▸ noun:  mail that is distributed by a rapid and efficient system
▸ verb:  manifest the effects of (a gene or genetic trait) ("Many of the laboratory animals express the trait")
▸ verb:  articulate; either verbally or with a cry, shout, or noise ("She expressed her anger")
▸ verb:  give expression to
▸ verb:  send my rapid transport or special messenger service ("She expressed the letter to Florida")
▸ verb:  indicate through a symbol, formula, etc. ("Can you express this distance in kilometers?")
▸ verb:  obtain from a substance, as by mechanical action ("Italians express coffee rather than filter it")
▸ verb:  serve as a means for expressing something
▸ adjective:  not tacit or implied ("Her express wish")
▸ adjective:  without unnecessary stops ("An express train")
▸ adverb:  by express ("Please send the letter express")

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▸ Also see express