IPA: /səˈpriːm/
KK: /səˈprim/
The highest in rank, power, or quality; the most important or significant.
The supreme leader made a crucial decision for the country.
Supreme is derived from the Latin 'supremus' (meaning highest or utmost), which is a superlative form of 'super' (meaning above or over). The word 'supreme' refers to something that is the highest in rank, authority, or quality.
Think of 'above' ('super') to remember that 'supreme' means the highest or utmost in rank or quality.