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> data to be transmitted in a byte, word or double word oriented format (i.e. in 8, 16 or 32-bits per code unit)

I don't think I've heard "word" mean "16 bits" since the 1980's ... and apparently neither has Wikipedia: https://en.wikipedia.org/wiki/Word_(computer_architecture)#T...

(QWORD 64 bits)

The concept of the word size of an architecture is different than "word" which has long been used colloquially in computing to mean two bytes.

2 nibbles are a byte. 2 bytes are a word.

Edit: "Word" as two bytes may actually be a microcomputer-specific colloquialism.