Secret or enigmatical language.
The science or study of mathematical, linguistic, and other coding patterns and histories.
The practice of analysing encoded messages, in order to decode them.
A reference or allusion to something.
A nomination.
An instance of inclining the head up and down, as to indicate agreement, or as a cursory greeting.
Approval.
To signify by a nod.
To incline the head up and down, as to indicate agreement.
To allude to something.
To sway, move up and down.
To make a mistake by being temporarily inattentive or tired
To briefly incline the head downwards as a cursory greeting.
To fall asleep while under the influence of opiates.
To gradually fall asleep.
To head; to strike the ball with one's head.