Expression

Linguistics

Expression (linguistics), a word, phrase, or sentence
Expression (mathematics), Symbolic description of a mathematical object
Fixed expression, a form of words with a specific meaning
Idiom, a type of fixed expression
Metaphorical expression, a particular word, phrase, or form of words that has a different meaning than its literal form
Expression (sign language), the expressions and postures of the face and body that contribute to the formation of words when signing

Symbolic expression

Expression (architecture), implies a clear and authentic displaying of the character or personality of an individual person
Expression (mathematics), a symbolic description of a mathematical object
Expression (computer science), an instruction to execute something that will return a value
Regular expression, a means of matching strings of text in computing
Expression marks, in music, notating the musical dynamics
Symbolic computation expression
S-expression

Bodily expression

Expression of breast milk in breastfeeding
Emotional expression, verbal and non-verbal behaviour that communicates emotion
Facial expression, a movement of the face that conveys emotional state
Gene expression, the process by which information from a gene is used in biochemistry
The manual expression of pimples, also known as "pimple popping"

Expression (album), a 1967 album by John Coltrane
Expressions (Chick Corea album), a 1994 album by Chick Corea
Expressions (Sarah Geronimo album), 2013
Expressions, an album by Jon Secada
"Expression" (song), a song by Salt-n-Pepa
Expressions, the annual magazine of Vidyalankar Institute of Technology, Mumbai, India
Microsoft Expression Studio, a digital media and graphic design suite
Ex'pression College for Digital Arts, a college in Emeryville, California for the entertainment industry
The Expression (album)

Linguistics