[ 'ɛnsʌɪn ]
■ noun
1》 a flag, especially a military or naval one indicating nationality.
2》 the lowest rank of commissioned officer in the US and some other navies, above chief warrant officer and below lieutenant.
↘ historical the lowest rank of commissioned infantry officer in the British army.
3》 historical a standard-bearer.
Origin
ME: from OFr. enseigne , from L. insignia (see insignia ).