augment
vb
1 to make or become greater in number, amount, strength, etc.; increase
2 tr (Music) to increase (a major or perfect interval) by a semitone
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diminish →
3
3 tr (in Greek and Sanskrit grammar) to prefix a vowel or diphthong to (a verb) to form a past tense
n
4 (in Greek and Sanskrit grammar) a vowel or diphthong prefixed to a verb to form a past tense
(C15: from Late Latin augmentare to increase, from augmentum growth, from Latin augere to increase)
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augmentable adj
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augmentor, augmenter n