A bond in which two remain two and act as one. Partnership is a form rather than a feeling; it holds on the days nobody feels it.
From Latin partitio (a division), from pars (part), via partner and the suffix -ship (state, condition); a bond formalized as a standing arrangement rather than a feeling.
A bond in which two remain two while acting as one. It is a form that holds on the days nobody feels it, not only a feeling.