Cognate: 5051 teleiōtḗs (a masculine noun) – properly, a consummator, bringing a process to its finish (used only in Heb 12:2). See 5056 (telos).

5051 /teleiōtḗs ("consummator") specifically refers to Jesus, the one bringing the life of faith to its complete conclusion (consummation, finish). In every scene of His earthly life, Jesus lived in faith, i.e. receiving and perfectly obeying the inbirthing of the Father's will (persuasion).

Heb 12:2: "Fixing our eyes on Jesus, the file-leader 747 /arxēgós and consummator (5051 /teleiōtḗs) of the (operation of) faith (4102 /pístis), who in place of (473 /antí) the joy set before Him, endured a cross (4716 /staurós), despising the shame – and in combination (5037 /té) has taken-seat (Gk perfect tense), in (1722 /en) the right hand of the throne of God."