Look up contraction in Wiktionary, the free dictionary.

Contraction may refer to:

• Lanthanide contraction, the decrease in size of the ionic radius of lanthanide elements with their growing atomic number (series of Rare Earth Elements (REE) in the Mendeleev Table).
• Contraction (childbirth), a contraction during childbirth (basically referring to muscle contraction).
• Contraction (grammar), a shortened term formed by omitting the middle of a word or words.^[1]
• Syncope (phonetics), the loss or reduction of sounds within a word.
• Braille contraction, used to decrease space and increase reading speed.
• Economic contraction or recession, a reversal of economic growth; the opposite of economic expansion.
• The reverse of thermal expansion.
• Contraction mapping, in mathematics, a type of function on a metric space.
• Contraction (operator theory), in mathematics.
• Edge contraction or vertex contraction, graph operations used in graph theory.
• Muscle contraction, one that occurs when a muscle fiber lengthens or shortens.
• Tensor contraction in tensor theory (in mathematics).
• Contraction, a stage in wound healing.
• A structural rule in proof theory.
  Further information: idempotency of entailment

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