"αντ." meaning in Greek

{
  "forms": [
    {
      "form": "ant.",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "el",
        "2": "adjective"
      },
      "expansion": "αντ. • (ant.)",
      "name": "head"
    }
  ],
  "lang": "Greek",
  "lang_code": "el",
  "pos": "adj",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "(antíthetos): opposite, reversed, backward",
          "word": "αντίθετος"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Greek entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Abbreviation of αντίθετος (antíthetos): opposite, reversed, backward"
      ],
      "id": "en-αντ.-el-adj-OHK1qHcQ",
      "links": [
        [
          "αντίθετος",
          "αντίθετος#Greek"
        ],
        [
          "opposite",
          "opposite"
        ],
        [
          "reversed",
          "reversed"
        ],
        [
          "backward",
          "backward"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ]
    }
  ],
  "word": "αντ."
}

{
  "forms": [
    {
      "form": "ant.",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "el",
        "2": "adjective"
      },
      "expansion": "αντ. • (ant.)",
      "name": "head"
    }
  ],
  "lang": "Greek",
  "lang_code": "el",
  "pos": "adj",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "(antíthetos): opposite, reversed, backward",
          "word": "αντίθετος"
        }
      ],
      "categories": [
        "Greek abbreviations",
        "Greek adjectives",
        "Greek dictionary abbreviations",
        "Greek entries with incorrect language header",
        "Greek lemmas",
        "Greek terms spelled with .",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "Abbreviation of αντίθετος (antíthetos): opposite, reversed, backward"
      ],
      "links": [
        [
          "αντίθετος",
          "αντίθετος#Greek"
        ],
        [
          "opposite",
          "opposite"
        ],
        [
          "reversed",
          "reversed"
        ],
        [
          "backward",
          "backward"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ]
    }
  ],
  "word": "αντ."
}