Definition: to bring to an end, to complete, perfect
NASB Translation: accomplish (2), accomplished (1), finish (1), fulfill (1), full number (1), made perfect (4), made...perfect (1), make...perfect (1), make perfect (1), perfect (2), perfected (7), reach...goal (1), spending the full number (1).
KJV: And when they had fulfilled the days, as they returned, the child Jesus tarried behind in Jerusalem; and Joseph and his mother knew not of it.
NASB: and as they were returning, after spending the full number of days, the boy Jesus stayed behind in Jerusalem. But His parents were unaware of it,
KJV: And he said unto them, Go ye, and tell that fox, Behold, I cast out devils, and I do cures to day and to morrow, and the third day I shall be perfected.
NASB: And He said to them, "Go and tell that fox, 'Behold, I cast out demons and perform cures today and tomorrow, and the third day I reach My goal.'
KJV: But I have greater witness than that of John: for the works which the Father hath given me to finish, the same works that I do, bear witness of me, that the Father hath sent me.
NASB: "But the testimony which I have is greater than the testimony of John; for the works which the Father has given Me to accomplish-- the very works that I do-- testify about Me, that the Father has sent Me.