Anyābhilāṣitā-śūnyam (Brs. 1.1.11). The exact definition you'll find in the Bhakti-rasāmṛta-sindhu: anyābhilāṣitā-śūnyam. Śūnyam means completely devoid of any other desire. Anyābhilāṣitā-śūnyaṁ jñāna-karmādy-anāvṛtam (CC Madhya 19.167). And uncovered by the activities of knowledge or fruitive action. Ānukūlyena kṛṣṇānuśīlanam. Simply acting in favor of Kṛṣṇa: "Kṛṣṇa wants this, I shall do it." "Kṛṣṇa wants this fight"—Arjuna did it. Not for himself.
We shall keep always in mind that Arjuna was engaged into fight not for his personal self. For his personal self he denied: "Oh, what shall I do with this kingdom by fighting with my brothers and grandfather? No. Kṛṣṇa, excuse me. I cannot fight."
But when he understood that the fight is to be done for Kṛṣṇa, he took all the responsibility. Similarly, a Kṛṣṇa conscious person will not aspire anything for his sense gratification, but he will aspire for all the world for Kṛṣṇa's service. Is that clear?