1. The flag, banner, or standard of a regiment or a nation; any signal to give notice; a mark of distinction, rank, or office: formerly a commissioned officer of the lowest rank in a company of infantry, the senior of whom carried the regimental colours. Naval ensign, a large banner hoisted on a staff, over the stern of a ship, or at the gaff, when the ship is under sail, for the purpose chiefly of distinguishing the nationality.

2. To distinguish by some ornament or symbol.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• insigna,
• enlign,
• ensin,
• endin,
• pensin,
• enougn,
• engion,
• ensignia,
• unsin,
• ensight,
• engien,
• ensurign,
• engian,
• ensire,
• insign,
• resign,
• enolig,
• ensine,
• ensil,
• ensi

• tensing,
• enciso,
• enosis,
• unison,
• ending,
• easing,
• ensis,
• sensing.

The adjective form of the word "ensign" is "ensignial".

The plural of the "ensign" can be the "ensigns".

The singular of the "ensign" can be the "ensign".