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Original · left

Selenium (element)

A chemical element with symbol Se, used in electronics and essential in trace amounts for health.

First in use: c. 1817
Duplicate · right

Selenium (testing)

An open-source suite for automating web browsers, widely used for testing web applications.

First in use: c. 2004

Selenium / Selenium (element) / Selenium (testing)

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Named as a cure for Mercury, a rival testing tool.

Which meaning of Selenium is the original, and which one is the duplicate riding on its name? Selenium (element) came first (c. 1817). Selenium (testing) arrived in 2004. The data below shows which one owns the word now.

Wikipedia pageviews since 2015

Selenium (element)Selenium (testing)
English Wikipedia pageviews since July 2015 load here.

Duplicate's share of attention

Green line = duplicate's % · above 60 it owns the word · below 40 the original does

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The case for each meaning

Sourced definitions, usage stats and quotes

Original · c. 1817

Selenium (element)

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Duplicate · c. 2004

Selenium (testing)

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More duplicated terms

Programming & software