Unsegmented

Unsegmented is an adjective meaning not divided into segments or parts. It is used across disciplines to describe continuity, lack of subdivision, or the absence of metamerism. The opposite term is segmented or metameric.

In biology, unsegmented describes body plans that lack serial repetition of segments. Many organisms, such as flatworms (Platyhelminthes), have unsegmented bodies, while others, like annelids and arthropods, are clearly segmented. Segmentation provides modularity, and some lineages exhibit functional regionalization without true metamerism.

In linguistics, unsegmented writing lacks explicit word boundaries. Classical Chinese and some historical records are written without spaces, making word segmentation a crucial preprocessing step for natural language processing. In languages with explicit word boundaries, the text is considered segmented.

In economics, an unsegmented or undifferentiated market is one targeted by a single marketing mix for the entire audience. It can offer economies of scale but may overlook subgroup-specific needs, leading to a trade-off between broad reach and tailored messaging.

In computing and imaging, segmentation partitions data or images into meaningful regions. An unsegmented image or dataset has not undergone this partitioning, which can complicate analysis. Segmentation is a common preprocessing step in OCR, medical imaging, and machine-vision applications.