i/o

adjective1

1. •
   in/out, input/output (descriptive of data flow)

   • i/o devices are pieces of hardware used to communicate with a computer.

preposition1

1. •
   Initialism of instead of.

noun1

1. •
   Abbreviation of input/output.

   • In addition to the synchronous blocking I/O explored in the last two chapters, NIO also supports nonblocking I/O. — 2006