=

(mathematics) The equal sign. It asserts that two quantities or expressions have the same value.
2+2=4
1. (mathematics, computing theory, abuse of notation, with big O notation) Is. Used to state the relation that the expression on the left side of the sign is at most as large as the expression on the right.
  Synonyms: ∈, ⊂, ⊆ (depending on context)
  
  The statement $f(x)=O(log^{2}x)$ means that as $x$ gets arbitrarily large, $f(x)$ will never grow faster than some constant multiple of $log^{2}x$ .
(chemistry) A double bond; a chemical bond between two chemical elements involving four bonding electrons instead of the usual two.
(programming) The assignment operator. It assigns a value to a variable.
$price=18.95 (this causes $price to be 18.95 from now on)
(programming) An operator that compares if two values are equal. In some languages, == is used instead.
(lexicography) The same form as the headword.
sheep pl. =
(lexicography) Indicates synonyms of a word.
(Hittitology) Indicates morpheme boundaries in bound transcription of Hittite terms with clitics.

Usage notes[edit]

When used in big O notation, the = relation is asymmetric i.e. $O(x)=O(x^{2})$ is not equivalent to $O(x^{2})=O(x)$ . For a wider discussion on this usage, refer to this English Wikipedia article.

Quotations[edit]

For quotations using this term, see Citations:=.

Synonyms[edit]

(assignment): :=, ≔, ←
(compares if equal): ==, ⩵

Antonyms[edit]

(equals): ≠

Derived terms[edit]

Conjunction[edit]

=

(informal) The same as; equal to.
A wireless keyboard = a keyboard without a wire.

Vulpes vulpes = red fox.

Quotations[edit]

For quotations using this term, see Citations:=.

Antonyms[edit]

(equals): ≠

Japanese[edit]

Symbol[edit]

=

Alternative form of ゠

Latin[edit]

Symbol[edit]

=

symbol for sextans

=

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