"point of reference" meaning in English

{
  "etymology_text": ": point of reference < → δείτε τις λέξεις point, of και reference",
  "forms": [
    {
      "form": "point of reference"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "σημείο αναφοράς"
      ],
      "id": "el-point_of_reference-en-noun-r2cNvnWf"
    }
  ],
  "synonyms": [
    {
      "word": "reference point"
    }
  ],
  "word": "point of reference"
}

{
  "etymology_text": ": point of reference < → δείτε τις λέξεις point, of και reference",
  "forms": [
    {
      "form": "point of reference"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "σημείο αναφοράς"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "reference point"
    }
  ],
  "word": "point of reference"
}