Postulate a condition (5)
I believe the answer is:
state
This might be a double definition.
'postulate' is the first definition.
The definition and answer can be both to do with communicating as well as being verbs in their base form.
Maybe there's a link between them I don't understand?
'a condition' is the second definition.
(the state something is in)
Can you help me to learn more?
(Other definitions for state that I've seen before include "See 18" , "Condition - sovereign political power" , "eg Alaska" , "eg Iowa" , "Pomp; nation" .)