[per.tain] vi [ME perteinen, fr. MF partenir, fr. L pertinere to reach to, belong, fr. per- through + tenere to hold--more at thin] (14c) 1 a (1): to belong as a part, member, accessory, or product (2): to belong as an attribute, feature, or function "the destruction and havoc ~ing to war" (3): to belong as a duty or right "responsibilities that ~ to fatherhood" b: to be appropriate to something "the criteria ... will be different from those that ~ elsewhere --J. B. Conant"
2: to have reference "books ~ing to birds"