What is the meaning of Intercalary?

Describing a time period inserted between others; leap, (as in leap day, leap month, or leap year)

Inserted between other things

1. of a meristem: situated between zones of permanent tissue, thus a shoot growing at the base of a leaf, in comparison with apical growth at the tip of a root or plant.
2. of a wing vein: between the major veins common to insect wings.

of a meristem: situated between zones of permanent tissue, thus a shoot growing at the base of a leaf, in comparison with apical growth at the tip of a root or plant.

of a wing vein: between the major veins common to insect wings.

Such a time period

Source: wiktionary.org