The word prati is karma -pravacanīya when used in the sense of representative ('representative of') or exchange ('in exchange for').,
That which is like to the principal is called प्रतिनिधि. Giving in return for what is obtained, is प्रतिदान. As अभिमन्युरर्जुनतः प्रति Abhi-manyu is the representative of Arjuna. माषानस्मै तिलेभ्यः प्रतियच्छति he exchanges Mashas for these sesamum. In these senses prati governs the Ablative (II. 3. 11.),