contiguïser

Contiguïser is an extremely rare technical verb meaning to make contiguous — to bring two things into direct physical adjacency. Derived from the adjective contigu (adjacent, touching), it belongs almost exclusively to specialized technical or administrative writing (land parcels, urban planning) and is essentially never used in speech.

• Le projet vise à contiguïser les deux parcelles. — The project aims to make the two plots contiguous.
• Ces terrains ont été contiguïsés lors du remembrement. — These plots were made contiguous during the land consolidation.
• Il est rare de devoir contiguïser des espaces aussi éloignés. — It's rare to need to make such distant spaces contiguous.

This verb is so rare that most native French speakers have never used or even heard it — a learner is extremely unlikely to encounter it outside specialized planning or surveying documents.