Sorry, no...British English has almost no use for "z". Your links are to US dictionary sites. It's also 100% "for emphasis" even in the US. Nobody says "for emphasize/emphasise".
(My iPhone is drawing a red line under "emphasize"!)
English
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Still waiting...
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Edited by BOSS_TPH76: 2/20/2016 9:24:32 AMyes...but that is because in "for emphasis" it is still a noun. As it turns out the z and s spelling have coexisted in England for more than 150 years in the British dictionaries.