Definitions of segment:

• noun:   one of the parts into which something naturally divides

  Example: "A segment of an orange"

• noun:   one of several parts or pieces that fit with others to constitute a whole object

  Example: "Finished the final segment of the road"

• verb:   divide or split up

  Example: "The cells segmented"

• verb:   divide into segments

  Example: "Segment an orange"