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Webster 1828 Edition

ppr.

Coming together; collecting into one place.

Noun.

A collection or meeting together. Heb. 10.

assembling

present participle of assemble
She worked all night assembling the bicycle, but she succeeded.

assembling ‎(plural assemblings)

A gathering or assembly.
- 1824, Thomas Stackhouse, An epitome of the history, laws, and religion of Greece (page 281)
  This may perhaps be carried back to a more remote period than that in which the Persians invaded Greece, and may be traced to the annual assemblings of the people to sacrifice, at the graves of their departed friends […]