"-о" meaning in Bulgarian

{
  "forms": [
    {
      "form": "-o",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "bg",
        "2": "suffix",
        "head": "-о"
      },
      "expansion": "-о • (-o)",
      "name": "head"
    }
  ],
  "lang": "Bulgarian",
  "lang_code": "bg",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Bulgarian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "я́сен (jásen, “clear”) + -о (-o) → я́сно (jásno, “clearly”)",
          "type": "example"
        }
      ],
      "glosses": [
        "Suffix added to adjectives to produce adverbs."
      ],
      "id": "en--о-bg-suffix-KM6MAIN3",
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "-о"
}

{
  "forms": [
    {
      "form": "-o",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "bg",
        "2": "suffix",
        "head": "-о"
      },
      "expansion": "-о • (-o)",
      "name": "head"
    }
  ],
  "lang": "Bulgarian",
  "lang_code": "bg",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        "Bulgarian entries with incorrect language header",
        "Bulgarian lemmas",
        "Bulgarian suffixes",
        "Bulgarian terms with redundant head parameter"
      ],
      "examples": [
        {
          "text": "я́сен (jásen, “clear”) + -о (-o) → я́сно (jásno, “clearly”)",
          "type": "example"
        }
      ],
      "glosses": [
        "Suffix added to adjectives to produce adverbs."
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "-о"
}