Leviticus 8:22

איל המלאים — This means the same as איל השלמים, for the word מלואים is synonymous with the word שלמים; this term is used to describe the ram because by means of it they set the priest fully (ממלאין) and completely (משלימין) in their priestly office (cf. Sifra, Tzav, Mechilta d'Miluim 1 20).

וַיַּקְרֵב֙ אֶת־הָאַ֣יִל הַשֵּׁנִ֔י אֵ֖יל הַמִּלֻּאִ֑ים וַֽיִּסְמְכ֞וּ אַהֲרֹ֧ן וּבָנָ֛יו אֶת־יְדֵיהֶ֖ם עַל־רֹ֥אשׁ הָאָֽיִל׃

And he brought the other ram, the ram of consecration: and Aharon and his sons laid their hands upon the head of the ram.