Which one is more proper to use: 'allocable' or 'allocatable'? Sources say the former is derived from the original Latin word 'allocare', while the latter is a part-of-speech-variant of the English word 'allocate'. Also, is there a standard rule in English to form able-ending adjective of words terminating in 'ate'?

Thank you.

  • Ngram clearly shows that "allocable" is the more used term between the two: books.google.com/ngrams/… – user66974 Feb 4 '16 at 16:10
  • -able: - word-forming element expressing ability, capacity, fitness, from French, from Latin -ibilis,.. a suffix used to form nouns of instrument. in Latin, infinitives in -are took -abilis, others -ibilis; in English, -able tends to be used with native (and other non-Latin) words, -ible with words of obvious Latin origin (but there are exceptions). The Latin suffix is not etymologically connected with able, but it long has been popularly associated with it, and this has contributed to its survival as a living suffix. etymonline.com/index.php?term=-able – user66974 Feb 4 '16 at 16:16

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