superpose
Concise Oxford English Dictionary © 2008 Oxford University Press:
superpose/suːpəˈpəʊz/
▶verb place (something) on or above something else, especially so that they coincide.
– derivatives
superposed adjective,
superposition noun.
superposed adjective,
superposition noun.
– origin C19: from Fr. superposer.
'superpose' also found in these Oxford entries:

