An increase in width

• Become broader or wider or more extensive
• Make wider
• Getting broader
• Make larger, of clothes
• Extend in scope or range or area
• The act of making something wider

Wikipedia Word definitions in Wikipedia
In computer science , especially model checking and abstract interpretation , widening refers to at least two different techniques in the analysis of abstract transition systems where infinite progressions of abstract states are replaced by a (computed ...

WordNet Word definitions in WordNet
n. an increase in width [syn: broadening ] [ant: narrowing ] a part of a road that has been widened to allow cars to pass or park [syn: turnout ] the act of making something wider [syn: broadening ] [ant: narrowing ]

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Widen \Wid"en\, v. t. [imp. & p. p. Widened ; p. pr. & vb. n. Widening .] To make wide or wider; to extend in breadth; to increase the width of; as, to widen a field; to widen a breach; to widen a stocking.