1. A private sign given to soldiers on guard, as a password or watchword; a counter-signature.

2. To attest by counter-signature.

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

• counterside,
• xountersign,
• vountersign,
• fountersign,
• dountersign,
• ciuntersign,
• ckuntersign,
• cluntersign,
• cpuntersign,
• c0untersign,
• c9untersign,
• coyntersign,
• counteresign,
• counersign,
• countrsign,
• countesign,
• counterign,
• countersine,
• counter sign,
• Counterlith

• counterfoil,
• countercharge,
• counterglow,
• counter tube,
• counter-drill,
• counteractive,
• commuter,
• countertop,
• counterstain,
• countercurrent,
• countermine,
• counterfeiter,
• counteroffer,
• counterfeit,
• contrite,
• counteract,
• conterminous,
• counterpart,
• counterfire,
• counterpoised,
• counter check,
• counterattack,
• counterblast,
• counterbalance,
• countershot,
• counterpoise,
• countermove,
• counterpose,
• counterplot,
• countermarch,
• countervailing,
• counterpoison,
• counterpane,
• countertenor,
• counterspy,
• controversial,
• counterplea,
• counterblow,
• counterplan,
• counterbore,
• countermelody,
• Contreras,
• counterman,
• counterchange,
• countersuit,
• counterplay,
• counterpunch,
• countervail,
• counterweight,
• countering,
• counterclaim,
• Conteras,
• countercheck,
• counterpoint,
• counterperson,
• counterstrike,
• countersink,
• counterwoman,
• counteraction,
• countermand,
• countercoup.

The adverb form of the word "countersign" is "countersigned".

The adjective form of the word "countersign" is "countersigned".

The plural of the "countersign" can be the "countersigns".

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