[1] : The Collaborative International Dictionary of English v.0.48

imbrication \im`brica"tion\, n. cf. f. imbrication.
   an overlapping of the edges, like that of tiles or shingles;
   hence, intricacy of structure; also, a pattern or decoration
   representing such a structure.
   1913 webster

[2] : WordNet (r) 2.0

imbrication
     n : covering with a design in which one element covers a part of
         another as with tiles or shingles syn: overlapping,
         lapping
see also:
overlapping lapping 

Imbrication >> I Words
Imbrication, definition of term: Imbrication
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