Definition of approximating:
(adj) :
Nearing correctness; nearly exact; not perfectly accurate.
(adj) :
Approaching; proximate; nearly resembling.
(v) :
(transitive) To come near to; to approach.
(v) :
(transitive) To carry or advance near; to cause to approach.
(v) :
(ambitransitive) To estimate.
(adj) :
(botany) Drawn close together, but not united.