• (n.) The act of making into a castle.
battlements. Implying use as decorative feature
Metallised semicircular radial features on the edges of LCCCs that interconnect conducting surfaces. Castellations typically are found on all four edges of a leadless chip carrier. Each lies within the termination area for direct attachment to the land patterns. 
Cas`tel·la'tion noun [ Late Latin castellation , from castellare , from Latin castellum . See Castle .] The act of making into a castle.