Segmentation refers to the process of dividing or separating something into smaller parts or sections. Antonyms for the word "segmentations" could include "unification," "amalgamation," "integration," "fusion," and "merger." All of these words imply bringing disparate things together rather than breaking them apart. Rather than dividing something into smaller parts, these words suggest bringing different parts together to form a larger whole, creating a united structure. In a corporate context, this might refer to merging two companies into one, while in a more general context, it might imply bringing together different ideas or perspectives to form a cohesive whole.