The aim of the present paper is to argue for the interpretation of Phrygian mekas as an adjective meaning 'great' and inherited from PIE *méǵ-h2-, taking into account all its testimonies documented in the Phrygian corpus and accepting the theory of a Phrygian Lautverschiebung. Furthermore, through a new reading of the last lines of the recently discovered New Phrygian inscription from Nacoleia, where the accusative μεκαν can be read in agreement with the theonym Τιαν, a new interpretation of the apodosis of the New Phrygian inscription 25 is given. Finally, a comparison of the Phrygian and the Greek forms reveals a common innovation in the presence of the ending -s in the masculine nom. sg. despite the lack of the -λο- suffix in the Phrygian inflection of this word.