ASK to pass variable over another host

i got some situation :
host file : development
[master]
1.2.3.4
[client]
1.2.3.5 dump_var=“testing”
1.2.3.10 dump_var=“test2”

yml file :
site.yml

Absolutely!

Read this chapter about “hostvars”:

http://docs.ansible.com/playbooks_variables.html#magic-variables-and-how-to-access-information-about-other-hosts