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Webster 1913 Edition

Adj.

[Cf. F.

synchronique

Happening at the same time; synchronous.

Boyle.

–

Syn-chron′ic-al-ly

adv.

Adj.

[See Synchronism.] Happening at the same time; simultaneous.

synchronical ‎(not comparable)

Happening at the same time; synchronous.
(Can we find and add a quotation of Boyle to this entry?)