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Webster 1913 Edition

Noun.

Adj.

from

Adj.

☞ Used either adjectively or as the first part of a compound; as, dining hall or dining-hall, dining room, dining table, etc.

ppr.

Eating the principal meal in the day.

dining ‎(countable and uncountable, plural dinings)

Eating dinner as a social function.
- 1869, The XIX Century (volume 1, page 6)
  For my own part I preferred to remain with the ship, and I am now glad that I did so, for the welcome we received at Havana; the cheering crowds upon the quay; the friends we met and made; the dinings in and dinings out […]
Entertaining someone to dinner.

dining