dyadic
adjective uk/daɪˈæd.ɪk/ us/daɪˈæd.ɪk/
formal二元体的，二分体的
consisting of two parts
a dyadic conception of government 政府二元体概念
social science specialized（社会关系）二人组合的
relating to the interaction between two people
Even dyadic interactions can be very complex. 即使二人组合之间的互动也可能相当复杂。