a look or intonation expressing personal reaction, feeling, etc.: a shocked expression.
7.
the quality or power of expressing an attitude, emotion, etc.: a face that lacks expression; to read with expression.
8.
the act of expressing or representing, as by symbols.
9.
Mathematics. a symbol or a combination of symbols representing a value, relation, or the like.
10.
Linguistics. the stylistic characteristics of an utterance (opposed to meaning).
11.
Linguistics. the system of verbal utterances specific to a language (opposed to content).
12.
the act of expressing or pressing out.
13.
Computers. a combination of variables, constants, and functions linked by operation symbols and any required punctuation that describe a rule for calculating a value.
14.
Genetics.
a.
the action of a gene in the production of a protein or a phenotype.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a chattering or flighty, light-headed person.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.