noun
party platform; party principles
Refers to the fundamental policies or guiding principles of a political party. Often used in formal or journalistic contexts.
党是に従って政策を決定する。
Policies are decided in accordance with the party platform.
その党是は長年変わっていない。
That party's principles have not changed for many years.
Compound of 党 (party) and 是 (right, justice, this), literally meaning 'what is right for the party' or 'party's correct path'.