A Greek noun meaning advocate, helper, comforter, counselor, intercessor, one called alongside. From para (alongside) and kaleō (to call) — 'one called to stand beside.' In secular Greek, it referred to a legal advocate or defense attorney — someone summoned to plead another's case. In the New Testament, it is used exclusively by John — four times for the Holy Spirit and once for Christ.
This is one of the most theologically rich titles in Scripture. Jesus promises 'another Advocate' (John 14:16) — the word 'another' (allos, another of the same kind) implies that Jesus Himself was the first Paraklētos, and the Spirit is His successor in the same role. The Spirit will 'teach you all things' (John 14:26), 'bear witness about me' (John 15:26), and 'convict the world concerning sin' (John 16:8). In 1 John 2:1, Jesus is called our Paraklētos 'with the Father' — our defense attorney before the divine court. The double advocacy is stunning: the Spirit advocates for us within (interceding), and Christ advocates for us above (representing us before the Father). We are never without an Advocate.