To exist together, at the same time, or in the same place.
To live in peace with another or others despite differences, especially as a matter of policy: "recognize and accept, as every President in the nuclear age has, that this means coexisting with the Soviet Union” ( McGeorge Bundy).
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.