"microvariation" meaning in English

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      "expansion": "Etymology tree\nProto-Indo-European *mey-der.?\nAncient Greek μικρός (mikrós)der.\nEnglish micro-\nEnglish variation\nEnglish microvariation\n[Appendix:Glossary#derived_terms|Derived]] from\", \"terms\" : [ { \"id\" : \"small\", \"children\" : [ { \"keyword_abbrev\" : \"der.\", \"keyword_label\" : \"Derived from\", \"terms\" : [ { \"is_uncertain\" : true, \"id\" : \"little\", \"children\" : [ ], \"status\" : \"ok\", \"lang_name\" : \"Proto-Indo-European\", \"term\" : \"*mey-\", \"lang\" : \"ine-pro\" } ], \"keyword\" : \"derived\" } ], \"status\" : \"ok\", \"lang_name\" : \"Ancient Greek\", \"term\" : \"μικρός\", \"lang\" : \"grc\" } ], \"keyword\" : \"derived\" } ], \"lang_name\" : \"English\", \"term\" : \"micro-\", \"status\" : \"ok\", \"lang\" : \"en\" }, { \"children\" : [ ], \"lang_name\" : \"English\", \"term\" : \"variation\", \"status\" : \"missing\", \"lang\" : \"en\" } ], \"keyword_label\" : \"From\", \"is_group\" : true, \"keyword\" : \"affix\" } ], \"lang_name\" : \"English\", \"term\" : \"microvariation\", \"status\" : \"ok\", \"lang\" : \"en\" }\" data-lang=\"en\" data-title=\"microvariation\">\nFrom micro- + variation.",
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  "etymology_text": "Etymology tree\nProto-Indo-European *mey-der.?\nAncient Greek μικρός (mikrós)der.\nEnglish micro-\nEnglish variation\nEnglish microvariation\nFrom micro- + variation.",
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          "ref": "2009 January 19, Jon Caramanica, Nate Chinen, “New CDs”, in New York Times:",
          "text": "Taking cues from cabaret and Broadway and blues and gospel, his voice is spookily beautiful, but it’s constantly on the move, with microvariations in pitch and tone that keep the ear on edge.",
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      "glosses": [
        "A very slight variation"
      ],
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        {
          "word": "macrovariation"
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  "word": "microvariation"
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  "etymology_text": "Etymology tree\nProto-Indo-European *mey-der.?\nAncient Greek μικρός (mikrós)der.\nEnglish micro-\nEnglish variation\nEnglish microvariation\nFrom micro- + variation.",
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