A Fluxion

Depending on the context, fluxion typically refers to one of three things:

1. Mathematics (Newtonian Calculus)

In the late 17th century, Isaac Newton coined the term "fluxion" to describe the instantaneous rate of change of a continuously varying quantity (which he called a "fluent"). Today, we refer to this as a derivative. Newton denoted fluxions using a dot over the variable (e.g., \(\dot{x}\)), a notation still used in physics to indicate time derivatives.

In the late 17th century, Isaac Newton coined the term "fluxion" to describe the instantaneous rate of change of a continuously varying quantity (which he called a "fluent"). Today, we refer to this as a derivative. Newton denoted fluxions using a dot over the variable (e.g., \(\dot{x}\)), a notation still used in physics to indicate time derivatives.

2. Cybersecurity (Penetration Testing)

Fluxion is a well-known open-source Wi-Fi security auditing tool for Linux. Security professionals use it to test WPA/WPA2 network vulnerabilities. Instead of relying heavily on brute-force dictionary attacks, it typically deploys an "Evil Twin" attack—creating a clone of the target network to trick users into handing over their Wi-Fi password via a captive portal.

3. General Definition

Historically or in a medical context, it simply refers to the act of flowing, continuous movement, or a discharge of fluid.