intercalary

adjective in·ter·ca·la·ry \in-ˈtər-kə-ˌler-ē, ˌin-tər-ˈka-lə-rē\

Definition of INTERCALARY

a : inserted in a calendar <an intercalary day>

b of a year : containing an intercalary period (as a day or month)

: inserted between other things or parts : interpolated

Latin intercalarius, from intercalare

First Known Use: 1614

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