Definition of taconic:
(n) :
A mountain range in New England, United States; A low mountain range in eastern New York, western Massachusetts, and southwestern Vermont.
(n) :
(geology) The geological process that resulted in the precursor to the modern Taconic mountain range and shaped much of the Appalachian range, or the time period in the early Silurian during which this occurred
(adj) :
(geology) Relating to the geological process which created the Taconic mountain range.
(n) :
A town in New York, United States.