The headword is found in a range of contexts where it bears the general senses translated above; it was also the Pythagoreans' special name for the number 10; see LSJ s.v.
Here it is in the accusative case (with the same glossing adjective as in other lexica; references at Photius pi171 Theodoridis), so evidently quoted from somewhere. There are possibilities in e.g. Polybius, Plutarch, and Philo of Alexandria; note also the phrase th\n pante/leian tw=n a)gaqw=n in a fragment of Diotimus of Tyre (fr. 2 D-K) quoted by Clement of Alexandria.