quasi-, semi-, associate
准 centers on a status that is almost but not fully something: quasi-, semi-, or an associate level rather than the full or primary one.
准 is the simplified form of 準. The older form 準 combines 水 (water) and 隼 (a falcon-like bird), which likely contributed the sound. The modern 准 keeps 隹 (a short-tailed bird) and adds 冫 (ice), but the historical connection to water and leveling is uncertain in the simplified shape.
The left side 冫 suggests ice, and the right side 隹 is a bird. Imagine a bird that is almost frozen—it's quasi-ice, semi-frozen, an associate of true ice.
For ジュン, picture a junior associate who is almost a full member: junior -> ジュン, and the quasi-status fits the kanji's meaning.
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ratification
warrant officer
chief warrant officer
warrant officer
commodore; brigadier general
associate professor
baronet
assistant nurse; practical nurse
(female) assistant nurse; practical nurse
assistant nurse; practical nurse
warrant officer (JASDF)
Cundi (manifestation of Avalokitesvara)
approval; sanction
instrument of ratification