software

mastery
UK /ˈsɒf(t)ˌwɛə/ US /ˈsɔf(t)ˌwɛɹ/noun

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Which word is closest in meaning to 'software' in this sentence?

The 'software' comprising the carefully planned interpretive routines, compilers, and other aspects of automative programming are at least as important to the modern electronic calculator as its 'hardware' of tubes, transistors, wires, tapes and the like.