2 Listen to the Gospel: “And it was at Jerusalem the Encœnia.” Encoenia was the festival of the dedication of the temple. For in Greek kainos means new; and whenever there was some new dedication, it was called Encœnia. And now this word has come into common use; if one puts on a new coat, he is said “encœniare” (to renovate, or to hold an encœnia). For the Jews celebrated in a solemn manner the day on which the temple was dedicated; and it was the very feast day when the Lord spoke what has just been read.
Source: Tractates on the Gospel of John (New Advent)