If you are wondering what is the official meaning of Hanukkah as presented in Jewish liturgy, here is the text we insert for the holiday, no spin added,
And [we thank You] for the miracles, for the redemption, for the mighty deeds, for the saving acts, and for the wonders which You have wrought for our ancestors in those days, at this time.
In the days of Matityahu, the son of Yochanan the High Priest, the Hasmonean and his sons, when the wicked Hellenic government rose up against Your people Israel to make them forget Your Torah and violate the decrees of Your will.
But You, in Your abounding mercies, stood by them in the time of their distress. You waged their battles, defended their rights, and avenged the wrong done to them. You delivered the mighty into the hands of the weak, the many into the hands of the few, the impure into the hands of the pure, the wicked into the hands of the righteous, and the wanton sinners into the hands of those who occupy themselves with Your Torah.
You made a great and holy name for Yourself in Your world, and effected a great deliverance and redemption for Your people Israel to this very day. Then Your children entered the shrine of Your House, cleansed Your Temple, purified Your Sanctuary, kindled lights in Your holy courtyards, and instituted these eight days of Hanukkah to give thanks and praise to Your great Name.
And then of course the Talmud explains Hanukkah. Sorta.
There is no Mishnah or Talmud tractate for the festival of lights. Why is that? It is an incredible question. Not going to speculate. All we have in rabbinic literature is this.
The Talmud (Bavli Shabbat 21b) explains what is Hanukkah:
What is Hanukkah? For our Rabbis taught: On the twenty-fifth of Kislev commence the days of Hanukkah, which are eight on which a lamentation for the dead and fasting are forbidden.
For when the Greeks entered the Temple, they defiled all the oils therein, and when the Hasmonean dynasty prevailed against and defeated them, they made search and found only one cruse of oil which lay with the seal of the High Priest, but which contained sufficient for one day's lighting only; yet a miracle was wrought therein and they lit the lamp therewith for eight days.
The following year these days were appointed a Festival with the recital of Hallel and thanksgiving.
The Talmud (Bavli Shabbat 21b) explains what is Hanukkah:
What is Hanukkah? For our Rabbis taught: On the twenty-fifth of Kislev commence the days of Hanukkah, which are eight on which a lamentation for the dead and fasting are forbidden.
For when the Greeks entered the Temple, they defiled all the oils therein, and when the Hasmonean dynasty prevailed against and defeated them, they made search and found only one cruse of oil which lay with the seal of the High Priest, but which contained sufficient for one day's lighting only; yet a miracle was wrought therein and they lit the lamp therewith for eight days.
The following year these days were appointed a Festival with the recital of Hallel and thanksgiving.
What else is there to say?
Dreidls, gelt, and latkes come later.