1) Crossing 2) Interposition 3) Meshing 
• (n.) The state of interdigitating; interdigital space.
(in″tәr-dij″ĭ-ta´shәn) an interlocking of parts by finger-like processes. one of a set of finger-like processes.
In`ter·dig`i·ta'tion noun (Anat.) The state of interdigitating; interdigital space. Owen. 
Type: Term Pronunciation: in′tĕr-dij′i-tā′shŭn Definitions: 1. The mutual interlocking of toothed or tonguelike processes. 2. The processes thus interlocked. 3. Infoldings or plicae of adjacent cell or plasma membranes. Synonyms: intercuspation2
interdigitation 1. To become interlocked like the fingers of folded hands. 2. An interlocking of parts by fingerlike processes.