A shoot system meristem (PO:0006079) that is intercalated between two portions of non-meristematic tissue and results in an increase in length as part of primary growth. [source: ISBN:0080374913, ISBN:0122151704, POC:curators]
Comment
See subtypes: leaf intercalary meristem (PO:0006346) and stem intercalary meristem (PO:0006347). Not known to occur in roots. Term for primary growth has been requested in GO.