核心问题
altogether 与 all together 是不是同一个词的两种写法？
词典解答
它们不是同一个词。altogether 是副词，作“完全地”（entirely, completely）、“总共”“总的说来”解：
-
I don't altogether agree with him. (ALD) 我并不完全同意他。
-
Altogether there were six of us. (Evans) 我们总共6个人。
-
Altogether, it was a good paper. (MD) 总的说来, 这是一份很好的报纸。
-
The actor gave an altogether magnificent performance. (《韦氏词典》, 电子版) 那个演员的表演总的说来很动人。
-
The bill came to $67 altogether. (同上) 账单总共是六十七美元。
all 与 together 分开写, 是个短语, 意为“在一起”“一同”:
-
Now we say the poem all together. (Wood) 现在我们一起来念这首诗。
-
They were all together at the reunion. (Crews) 这次团聚他们都聚齐了。