"χ.η." meaning in Greek

{
  "forms": [
    {
      "form": "ch.i.",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "el",
        "2": "prepositional phrase"
      },
      "expansion": "χ.η. • (ch.i.)",
      "name": "head"
    }
  ],
  "lang": "Greek",
  "lang_code": "el",
  "pos": "prep_phrase",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "(chorís imerominía, “without date”): n.d. (no date) of books, articles, websites where the year-month-day of their publication is not mentioned",
          "word": "χωρίς ημερομηνία"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Greek entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Abbreviation of χωρίς ημερομηνία (chorís imerominía, “without date”): n.d. (no date) of books, articles, websites where the year-month-day of their publication is not mentioned"
      ],
      "id": "en-χ.η.-el-prep_phrase-VW7RWuVB",
      "links": [
        [
          "χωρίς",
          "χωρίς#Greek"
        ],
        [
          "ημερομηνία",
          "ημερομηνία#Greek"
        ],
        [
          "n.d.",
          "n.d."
        ],
        [
          "year",
          "year"
        ],
        [
          "month",
          "month"
        ],
        [
          "day",
          "day"
        ],
        [
          "publication",
          "publication"
        ],
        [
          "mention",
          "mention"
        ]
      ],
      "qualifier": "bibliographical abbreviations",
      "raw_glosses": [
        "(bibliographical abbreviations) Abbreviation of χωρίς ημερομηνία (chorís imerominía, “without date”): n.d. (no date) of books, articles, websites where the year-month-day of their publication is not mentioned"
      ],
      "related": [
        {
          "english": "n.p. (no publisher)",
          "roman": "ch.e.",
          "word": "χ.ε."
        },
        {
          "english": "sine anno",
          "word": "s.a."
        }
      ],
      "synonyms": [
        {
          "english": "no year, n.d. (no date)",
          "roman": "ch.ch.",
          "word": "χ.χ."
        }
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/xoˈris imeromiˈnia/"
    }
  ],
  "word": "χ.η."
}

{
  "forms": [
    {
      "form": "ch.i.",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "el",
        "2": "prepositional phrase"
      },
      "expansion": "χ.η. • (ch.i.)",
      "name": "head"
    }
  ],
  "lang": "Greek",
  "lang_code": "el",
  "pos": "prep_phrase",
  "related": [
    {
      "english": "n.p. (no publisher)",
      "roman": "ch.e.",
      "word": "χ.ε."
    },
    {
      "english": "sine anno",
      "word": "s.a."
    }
  ],
  "senses": [
    {
      "alt_of": [
        {
          "extra": "(chorís imerominía, “without date”): n.d. (no date) of books, articles, websites where the year-month-day of their publication is not mentioned",
          "word": "χωρίς ημερομηνία"
        }
      ],
      "categories": [
        "Greek abbreviations",
        "Greek bibliographical abbreviations",
        "Greek entries with incorrect language header",
        "Greek lemmas",
        "Greek prepositional phrases",
        "Greek terms spelled with .",
        "Greek terms with IPA pronunciation"
      ],
      "glosses": [
        "Abbreviation of χωρίς ημερομηνία (chorís imerominía, “without date”): n.d. (no date) of books, articles, websites where the year-month-day of their publication is not mentioned"
      ],
      "links": [
        [
          "χωρίς",
          "χωρίς#Greek"
        ],
        [
          "ημερομηνία",
          "ημερομηνία#Greek"
        ],
        [
          "n.d.",
          "n.d."
        ],
        [
          "year",
          "year"
        ],
        [
          "month",
          "month"
        ],
        [
          "day",
          "day"
        ],
        [
          "publication",
          "publication"
        ],
        [
          "mention",
          "mention"
        ]
      ],
      "qualifier": "bibliographical abbreviations",
      "raw_glosses": [
        "(bibliographical abbreviations) Abbreviation of χωρίς ημερομηνία (chorís imerominía, “without date”): n.d. (no date) of books, articles, websites where the year-month-day of their publication is not mentioned"
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/xoˈris imeromiˈnia/"
    }
  ],
  "synonyms": [
    {
      "english": "no year, n.d. (no date)",
      "roman": "ch.ch.",
      "word": "χ.χ."
    }
  ],
  "word": "χ.η."
}