• Concatenation, a computer programming operation that joins strings together
• Concatenation (mathematics), a mathematical operation that combines two vectors
• Concatenated SMS, a way of combining multiple SMS text messages sent to cellular phones
• Packet concatenation, a computer networking optimization that coalesces multiple packets under a single header.
• Cat (Unix), a Unix command to write the contents of one or more files to the standard output
• Concatenation is the opening track of Swedish Tech Metal band Meshuggah's album Chaosphere.

See also

• Catenation