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1.
!=
Definition: "not equal to."

Background: In most popular programming languages, "!" belongs to a class of operators known as "logic operators." Basically, it just stands for "not", "opposite", or "false", depending on what the context is. Two other operators are in this class: "||" for "or", and "&&" for "and".

"!=" belongs to another class of operators called "comparison operators." Also in this class are things like "==" (equals), ">=" (greater than or equal to), "<" (less than), etc.
5 != 6 :: Five (is) not equal to Six.

Short != Tall :: Short (is) not equal to Tall
by Nikkki November 23, 2004
 
2.
! =
Not equal. The "!" is used as syntax for "not".

Always used with the "!" before the "="
Highly Flamible Cow ! = teh 1337
by BinaryHelix November 21, 2004
 
3.
!=
Not equal to.
Hooper != h4x0r
by Drunken F00l April 07, 2003
 
4.
!=
Used in various programming languages to denote "Not-Equal".
Justin != Josh.

A != B.

1 != 3.
by Psycho_85602 December 07, 2007