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Webster 1913 Edition

Adj.

Without an aisle.

aisless ‎(not comparable)

Alternative form of aisleless
- 1954, G. W. O. Addleshaw, The Development of the Parochial System: From Charlamagne to Urban II (page 16)
  But this south aisle is an excellent example of what a village church of the time looked like, when built of stone and not of wood — lofty in proportion to its width, an aisless nave, a tiny chancel and a west tower.