Definition -
(1) Incorrect spelling.
(2) A bad system of spelling.

Example -
Some claim that English has a cacographic spelling system. For example, it allows the possibility of spelling the word fish as ghoti. Here's how:
(1) gh pronounced /f/ as in tough
(2) o pronounced /ɪ/ as in women and
(3) ti pronounced /ʃ/ as in nation.

Etymology -
The word derives from the Greek kakos, bad + graphia, writing.

Oxford English Dictionary -
Its first citation is from 1580:
"We may still wonder and find fault with our Orthographie (or rather Cacographie in deed)."
(Baret Alv. Let. E.)

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