adjective

1. above or superior to all others; chief; greatest; supreme
2. supreme in power, rank, or authority
3. of or holding the position of ruler; royal; reigning
4. independent of all others a sovereign state
5. excellent; outstanding
6. very effectual, as a cure or remedy

Etymology: ME soveraine < OFr < VL *superanus < L super, above, over

noun

1. a person who possesses sovereign authority or power; specif., a monarch or ruler
2. a British gold coin valued at 20 shillings or one pound sterling, no longer minted for circulation