Alll together means ´in a group ´  The children were all together at the park.

 

Altogether” is an adverb meaning “completely,” “entirely.” For example: “When he first saw the examination questions, he was altogether baffled.” “All together,” in contrast, is a phrase meaning “in a group.” For example: “The wedding guests were gathered all together in the garden.” Undressed people are said in informal speech to be “in the altogether” (perhaps a shortening of the phrase “altogether naked” ).