The term can be defined as a signal that is continuous over a period of time as opposed to digital, which is a non-continuous signal.
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The term analog can be defined as a signal that is continuous over a period of time as opposed to digital, which is a non-continuous signal.

Explanation:

An analog signal is a signal that can assume any value from a continuous range (infinite or limited by the range of variation). Its values can be determined at any time, thanks to the mathematical function describing the given signal. The opposite of an analog signal is a digital signal.

from the conditions of the working class in england by friedrich engels,the main idea is :

a social contract.

"a social contract is an agreement between citizens and their leader where the citizens give up certain freedoms in exchange for protection. the constitution of the united states is an example of a social contract."