Which word means 'a set of words or images used to communicate a message in a secret way'?

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Multiple Choice

Which word means 'a set of words or images used to communicate a message in a secret way'?

Explanation:
A code is a system for secret communication where words or images are used to convey messages in a hidden way. It works by applying specific substitutions or rules so that someone who knows the code can understand the message while others can’t. The other words refer to timing, a pledge, or starting something, none of which describe a secret messaging system.

A code is a system for secret communication where words or images are used to convey messages in a hidden way. It works by applying specific substitutions or rules so that someone who knows the code can understand the message while others can’t. The other words refer to timing, a pledge, or starting something, none of which describe a secret messaging system.

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