"o-" meaning in Swedish

{
  "etymology_templates": [
    {
      "args": {
        "1": "sv",
        "2": "gmq-osw",
        "3": "ō-"
      },
      "expansion": "Old Swedish ō-",
      "name": "der"
    },
    {
      "args": {
        "1": "sv",
        "2": "non",
        "3": "ú-"
      },
      "expansion": "Old Norse ú-",
      "name": "der"
    },
    {
      "args": {
        "1": "sv",
        "2": "gem-pro",
        "3": "*un-"
      },
      "expansion": "Proto-Germanic *un-",
      "name": "der"
    },
    {
      "args": {
        "1": "sv",
        "2": "ine-pro",
        "3": "*n̥-"
      },
      "expansion": "Proto-Indo-European *n̥-",
      "name": "der"
    }
  ],
  "etymology_text": "From Old Swedish ō-, from Old Norse ú-, ó-, from Proto-Germanic *un-, from the Proto-Indo-European *n̥- whence also Greek α- (a-) and English un-.",
  "head_templates": [
    {
      "args": {
        "1": "sv",
        "2": "prefix"
      },
      "expansion": "o-",
      "name": "head"
    }
  ],
  "lang": "Swedish",
  "lang_code": "sv",
  "pos": "prefix",
  "senses": [
    {
      "categories": [
        {
          "_dis": "5 1 0 12 0 13 13 3 12 0 0 5 5 5 13 14",
          "kind": "other",
          "name": "Pages using catfix",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "50 50",
          "kind": "other",
          "name": "Swedish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "Added to adjectives to yield their opposites; un-"
      ],
      "id": "en-o--sv-prefix-fuvZOV7O",
      "links": [
        [
          "opposite",
          "opposite#English"
        ],
        [
          "un-",
          "un-#English"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    },
    {
      "categories": [
        {
          "_dis": "5 1 0 12 0 13 13 3 12 0 0 5 5 5 13 14",
          "kind": "other",
          "name": "Pages using catfix",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "50 50",
          "kind": "other",
          "name": "Swedish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "Added to nouns to mean lack or being without"
      ],
      "id": "en-o--sv-prefix-kGPiLEar",
      "links": [
        [
          "lack",
          "lack#English"
        ],
        [
          "without",
          "without#English"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/²uː/"
    }
  ],
  "word": "o-"
}

{
  "categories": [
    "Pages using catfix",
    "Pages with 25 entries",
    "Pages with entries",
    "Swedish entries with incorrect language header",
    "Swedish lemmas",
    "Swedish prefixes",
    "Swedish terms derived from Old Norse",
    "Swedish terms derived from Old Swedish",
    "Swedish terms derived from Proto-Germanic",
    "Swedish terms derived from Proto-Indo-European"
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "sv",
        "2": "gmq-osw",
        "3": "ō-"
      },
      "expansion": "Old Swedish ō-",
      "name": "der"
    },
    {
      "args": {
        "1": "sv",
        "2": "non",
        "3": "ú-"
      },
      "expansion": "Old Norse ú-",
      "name": "der"
    },
    {
      "args": {
        "1": "sv",
        "2": "gem-pro",
        "3": "*un-"
      },
      "expansion": "Proto-Germanic *un-",
      "name": "der"
    },
    {
      "args": {
        "1": "sv",
        "2": "ine-pro",
        "3": "*n̥-"
      },
      "expansion": "Proto-Indo-European *n̥-",
      "name": "der"
    }
  ],
  "etymology_text": "From Old Swedish ō-, from Old Norse ú-, ó-, from Proto-Germanic *un-, from the Proto-Indo-European *n̥- whence also Greek α- (a-) and English un-.",
  "head_templates": [
    {
      "args": {
        "1": "sv",
        "2": "prefix"
      },
      "expansion": "o-",
      "name": "head"
    }
  ],
  "lang": "Swedish",
  "lang_code": "sv",
  "pos": "prefix",
  "senses": [
    {
      "glosses": [
        "Added to adjectives to yield their opposites; un-"
      ],
      "links": [
        [
          "opposite",
          "opposite#English"
        ],
        [
          "un-",
          "un-#English"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    },
    {
      "glosses": [
        "Added to nouns to mean lack or being without"
      ],
      "links": [
        [
          "lack",
          "lack#English"
        ],
        [
          "without",
          "without#English"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/²uː/"
    }
  ],
  "word": "o-"
}