圆满 (yuán mǎn) describes an outcome or situation that is completely satisfactory and free of shortcomings, often used for events, results, or endings (圆满成功, 圆满结局). It differs from 完美 (wán měi), which means 'perfect' in a broader sense (no flaws at all), and from 美满 (měi mǎn), which specifically describes happy and harmonious family life or relationships. 完备 (wán bèi) focuses on being fully equipped or having all necessary components, not on satisfaction.