Correct spelling, explanation: there are two similar adjective suffixes often confused: -able and -ible. There are some rules when to use which, however there are also many exceptions, and convertible is one of them. Generally we add the suffix -able to full words (so, if we take the suffix there is a full word left), for example depend→ dependable. However we also usually add the suffix -ible to Latin-origin words, and convert is one of them. Moreover convertible might have been taken directly from Latin convertibilis, and thus it is spelled like this and not
Definition of convertible:
adjective, something that can be changed, possible to be converted
This piece of furniture is convertible: it can be a table or a hanger.
noun, a type of car with folding roof
I’ve always wanted a convertible!
Incorrect spelling, explanation:
convertable is a misspelling, as this adjective is written with suffix -ible, not -able. This may be misleading, since usually suffix -able is added to words that remain full without the suffix (for example understand → understandable). Latin-origin words, however, often use suffix -ible, therefore convertible is the correct spelling.
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