Russian ⇄ English

самый важный stresses
gen.	treasured (ad_notam); of utmost importance (SirReal); topmost; high-priority; arch; topside; most significant; front-rank; front rank; high priority; meat and potatoes; weightiest (DmitriySin); of paramount importance (Alexander Demidov); top of mind (of greatest concern or priority Artjaazz); of most importance (Stas-Soleil)
busin.	capital
dipl.	central
emph.	topping
inf.	meat-and-potatoes
Makarov.	top
progr.	the most important (ssn); most critical (ssn); most important (ssn)
slang	star
самое важное
gen.	the things; the great thing; number one; above all things; all about (Tanya Gesse); be-all and end-all; in all
idiom.	jewel in the crown (bigmaxus)
Makarov.	all in all

самым важным: 104 phrases in 19 subjects

American usage, not spelling	2
Business	1
Cinematography	2
Diplomacy	1
Figurative	1
General	21
Humorous / Jocular	1
Idiomatic	2
Informal	6
Information technology	1
Latin	1
Makarov	22
Management	1
Mass media	4
Military	7
Programming	23
Rhetoric	2
Scientific	3
Slang	3