different between commentation vs commensation

English

commentation (countable and uncountable, plural commentations)

The act or process of commenting or criticising; exposition.
- 1837, William Whewell, History of the Inductive Sciences
  the spirit of commentation
The work of a commentator.
(programming) Utilization of comments in source code.
In-program commentation is another level of documentation that is compulsory, with standards being set regarding what should be included in source code. Case Studies in Algorithms and Programming?^[1], 1997

commensation (uncountable)

(obsolete) commensality
- 1683, Thomas Browne, “Observations upon Several Plants Mention’d in Scripture” in Certain Miscellany Tracts
  Daniel […] declined pagan commensation.

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