Etymology
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Words related to Miocene

*mei- (2)

Proto-Indo-European root meaning "small."

It forms all or part of: administer; administration; comminute; diminish; meiosis; Menshevik; menu; metier; mince; minestrone; minim; minimum; minister; ministration; ministry; minor; minuend; minuet; minus; minuscule; minute; minutia; Miocene; mis- (2); mite (n.2) "little bit;" mystery (n.2) "handicraft, trade, art;" nimiety.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit miyate "diminishes, declines;" Greek meion "less, smaller;" Latin minus, minor "smaller," minuere "to diminish, reduce, lessen;" Old English minsian "to diminish;" Russian men'she "less."

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-cene 
word-forming element in geology, introduced by Sir Charles Lyell (1797-1875), from Latinized form of Greek kainos "new," cognate with Latin recens (see recent).
Eocene (adj.)

in reference to the second epoch of the Tertiary Period, 1831, from eo- "earliest" + Latinized form of Greek kainos "new" (see -cene). Coined in English (along with Miocene and Pliocene) by the Rev. William Whewell, English polymath, and meant as "the dawn of the recent." As a noun from 1851.

It has occurred to me that [kainos] is a better word than [neos], and I propose for your terms, 1 acene, 2 eocene, 3 miocene, 4 pliocene. ... For eocene you might say spaniocene, but I like your eo better. Is not this shortest and best? [Whewell, letter to Lyell, Jan. 31, 1831]
Pliocene (adj.)

in geology, in reference to the most recent division of the Tertiary, 1833, from plio- "more" (Latinized form of pleio-) + -cene "recent." Execrated by classical purists (along with Miocene and Eocene); a proper form from Greek would be *Plionocene. Roughly 5.3 million to 2.6 million years ago, it is distinguished from the other two epochs by having more fossils of still-existing species. The Pliocene and the more recent Pleistocene, both comparatively brief, commonly now are combined as the Plio-Pleistocene