Of software, etc., designed to work on various operating systems.(adjective)
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Use "cross-platform" in a sentence
"Her piece focused on the movie's marketing, described as a "cross-platform, trans-media campaign" involving "social media game play"."
"Again, it's part of the idea of cross-platform tools where designers or developers create something once and then produce output for multiple devices."
"Adobe has just about the worst security record for malicious, cross-platform exploits and for responding to reports in a timely manner (viz., the recent very late Acrobat patch)."