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Ask.com, the fourth-ranked search engine, has completed its acquisition of Lexico Publishing Group, which owns Dictionary.com, Thesaurus.com, and Reference.com.

Ask.com, a wholly owned subsidiary of InterActiveCorp, had announced the all-cash deal in mid-May.

Financial terms of the deal, which closed Thursday, were not released. Lexico, ...

Ask.com, the fourth-ranked search engine, plans to increase its heft through an agreement to acquire Lexico Publishing Group, which operates the Dictionary.com, Thesaurus.com, and Reference.com Web sites.

Ask.com didn't release terms of the acquisition, but Lexico is "highly profitable, with high double-digit growth for ...