[imp. & p. p. Intercalated ; p. pr. & vb. n. Intercalating .]
[L. intercalatus, p. p. of intercalare to intercalate to intercalate; inter between + calare to call, proclaim. See Calendar.]

1. (Chron.) To insert, as a day or other portion of time, in a calendar.

2. To insert among others, as a verse in a stanza; specif. (Geol.), to introduce as a bed or stratum, between the layers of a regular series of rocks.

Beds of fresh-water shells . . . are intercalated and interstratified with the shale.

Webster 1913 Dictionary edited by Patrick J. Cassidy