PARAKALEO is a common Greek word with a wide range of meaning. In general it has the idea of ask, beseech, exhort and urge. It can also mean to summon, invite, encourage, implore, appeal and comfort. As you can see the general sense of the word is encouragement. The noun form of this word (PARAKLTOS) is used to refer to the Holy Spirit in John 14:16, 26 and 15:26.