altogether (adv.)

"wholly, entirely, completely," early 13c., altogedere, a strengthened form of all (also see together); used in the sense of "a whole" from 1660s. OED notes, "There is a common tendency to write altogether where all together is logically preferable," and gives examples from 1765. The altogether "a condition of nakedness" is from 1894.

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Definitions of altogether
altogether (adv.)
with everything included or counted;
altogether he earns close to a million dollars
Synonyms: all told / in all
altogether (adv.)
with everything considered (and neglecting details);
altogether, I'm sorry it happened
Synonyms: all in all / on the whole / tout ensemble
altogether (adv.)
to a complete degree or to the full or entire extent (`whole' is often used informally for `wholly');
an altogether new approach
it was not altogether her fault
altogether (n.)
informal terms for nakedness;
in the altogether
Synonyms: raw / birthday suit