all together / altogether are similar-sounding terms with different meanings (referred to as homophones). To better understand the differences, see below for definitions, pronunciation guides, and example sentences using each term. 👇
all together: NA
altogether: (adverb) with everything included or counted.
all together: NA
altogether: AO·l·t·ah·g·EH·dh·er
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)