adv. 25B6; adverb IN A PERFECT WORLD; preferably, if possible, for preference, by choice, as a matter of choice, (much) rather; all things being equal, theoretically, hypothetically, in theory, in principle, on paper.
IDEALLY
Meaning of IDEALLY in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012