The Collaborative International Dictionary
Paromology
Paromology \Par`o*mol"o*gy\, n. [Gr. fr. ?, fr. ? to grant; ? by, near + ? to speak together, agree. See Homologous.] (Rhet.) A concession to an adversary in order to strengthen one's own argument.
Wiktionary
paromology
n. (context rhetoric English) A concession to an adversary in order to strengthen one's own argument.