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Webster 1913 Edition

Adj.

[See

Happening at, or belonging to, the same time; synchronous; simultaneous.

Dr. H. More.

Noun.

A synchronal thing or event.

Adj.

[Gr. with, and time.] Happening at the same time; simultaneous.

Noun.

[supra.] That which happens at the same time with something else, or pertains to the same time.

synchronal ‎(comparative more synchronal, superlative most synchronal)

Synchronous; simultaneous.
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United States Bureau of Mines, Dictionary of Mining, Mineral, and Related Terms (1996).