"JND" meaning in English

{
  "forms": [
    {
      "form": "JNDs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "JNDs"
      },
      "expansion": "JND (plural JNDs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English 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"
        }
      ],
      "examples": [
        {
          "text": "Aleah's nosejob was not dramatic. It was more like a JND, around half her friends noticed it and the other half did not.",
          "type": "example"
        },
        {
          "ref": "2009, Lionel Nicholas, Introduction to Psychology, page 75",
          "text": "The three laws of thresholds Weber's law states that, for a JND to be noticed, a constant ratio (relationship) exists between the intensity of a stimulus and the additional intensity required for a comparison to be made between the stimuli.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Just-noticeable difference, the amount by which something must be changed in order for it to be detectable at least 50% of the time."
      ],
      "id": "en-JND-en-noun-eW8yz2BE"
    }
  ],
  "word": "JND"
}

{
  "forms": [
    {
      "form": "JNDs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "JNDs"
      },
      "expansion": "JND (plural JNDs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms with quotations",
        "English terms with usage examples",
        "English words without vowels",
        "Pages with 1 entry"
      ],
      "examples": [
        {
          "text": "Aleah's nosejob was not dramatic. It was more like a JND, around half her friends noticed it and the other half did not.",
          "type": "example"
        },
        {
          "ref": "2009, Lionel Nicholas, Introduction to Psychology, page 75",
          "text": "The three laws of thresholds Weber's law states that, for a JND to be noticed, a constant ratio (relationship) exists between the intensity of a stimulus and the additional intensity required for a comparison to be made between the stimuli.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Just-noticeable difference, the amount by which something must be changed in order for it to be detectable at least 50% of the time."
      ]
    }
  ],
  "word": "JND"
}