[1] Mandarin (within the context of Greater China - mainland China, HK, Macau and Taiwan, although mainland China and increasingly HK and Macau the preferred term is 普通話)
[2] the national language (in the context of the country of the intended audience - for instance, in Malaysia, 國語 refers to Malay, or Japanese in Japan). | The preferred term for Mandarin outside Greater China is 華語 or 漢語