Etymology
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-ene 

hydrocarbon suffix, from Greek name-forming element -ene. It has no real meaning in itself; in chemistry terminology probably abstracted from methylene (1834). Put in systematic use by Hofmann (1865).

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-ate (1)

word-forming element used in forming nouns from Latin words ending in -atus, -atum (such as estate, primate, senate). Those that came to English via French often arrived with -at, but an -e was added after c. 1400 to indicate the long vowel. The suffix also can mark adjectives formed from Latin past participles in -atus, -ata (such as desolate, moderate, separate); again, they often were adopted in Middle English as -at, with an -e appended after c. 1400.

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