Cluster: A group or concentration of something in a specific area. In terms of language patterns, clusters represent areas where certain languages are spoken more frequently than others.
Dispersed: When something is scattered or spread out without any particular order or pattern. In terms of language patterns, dispersed refers to areas where there is no concentrated presence of any specific language.
Contiguous: When things are touching or sharing common borders. In terms of language patterns, contiguous refers to areas where neighboring regions share similar linguistic features or dialects due to their close proximity.