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v. Third-person singular simple present indicative form of intercalate.

"Conceiving that the stratified rocks of an epoch indicate a period of depression, and that the intervals between the epochs correspond with periods of elevation of which we have no record, he intercalates between the different epochs, or periods, intervals which he terms "Ante-periods.""

intercalated    intercalates    intercalating   

add   

bissextile year    bissextile    bissextile month   

intercalated    intercalating    intercalation    intercalary   

insert