Serjeant meaning : UK army rank with NATO code OR-6, senior to corporal and junior to warrant officer ranks. The highest rank of noncommissioned officer in some non-naval military forces and police. A lawyer of the highest rank, equivalent to the doctor of civil law. A title sometimes given to the servants of the sovereign. A fish, the cobia. Any of various nymphalid butterflies of the of the genus Athyma; distinguished from the false sergeants. A bailiff. A servant in monastic offices.