1704, "a collection of individuals," from French assemblage "gathering, assemblage," from assembler (see assemble). Earlier English words in the same sense include assemblement, assemblance (both late 15c.). Meaning "act of coming together" is from 1730; that of "act of fitting parts together" is from 1727.
assassin
assassinate
assassination
assault
assay
assemblage
assemble
assembly
assent
assert
assertion