Interpersonal means to do with how people deal with one another. Interpersonal skills, interpersonal conflict, an interpersonal problem.
Interpersonal skills is the phrase in every job advertisement and means getting on with people, which is harder to teach than anything technical. Calling a dispute interpersonal is a way of saying it is not about the work.
1adjectiveinterpersonalTo do with how people deal with one another.
“The course covers interpersonal communication, such as listening and handling conflict.”
interpersonal is a quality.
Proto-Indo-European
*ters-
Vulgar Latin
*interrāre — to put in earth
Old French
enterrer
Middle English
enteren
English
inter
English, today
interpersonal
From inter- + personal. inter comes from Middle English enteren, borrowed from Old French enterrer, enterer, from Vulgar Latin interrāre (“to put in earth”).
Etymology from Wiktionary, CC BY-SA