1640s (architectonical is from 1590s), "pertaining to architecture," from Latin architectonicus, from Greek arkhitektonikos "pertaining to a master builder," from arkhitekton "chief workman" (see architect). Metaphysical sense, "pertaining to systematization of knowledge," is from 1801.
Archibald
Archilochian
Archimedean
archipelago
architect
architectonic
architectural
architecture
architrave
archival
archive