consisting of, forming part of, or taking place in a series
a connector by which a device that sends data one bit at a time may be connected to a computer
a comma used after the penultimate item in a list of three or more items, before ‘and’ or ‘or’ (e.g. an Italian painter, sculptor, and architect)
an identification number showing the position of a printed or manufactured item in a series
the practice of engaging in a succession of monogamous sexual relationships
each of a series of thin sections through tissue cut in successive parallel planes, especially for mounting on microscope slides