Altogether and All together

Altogether is one word, meaning completely, absolutely.

• The actor gave an altogether magnificent performance.
• The bill came to $67 altogether.
• Altogether, I am glad we are moving.

All together, two words, means all at once, in the same place or at the same time.

Compare:

• You are altogether wrong.
• All together, pull!
• Put the glasses all together in the sink.