"Playfair cipher" meaning in All languages combined

{
  "etymology_text": "Named after Lord Playfair, who promoted it. (It was invented in 1854 by Charles Wheatstone.)",
  "forms": [
    {
      "form": "Playfair ciphers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Playfair cipher (plural Playfair ciphers)",
      "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"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "A manual symmetric encryption technique that encrypts pairs of letters (digraphs)."
      ],
      "id": "en-Playfair_cipher-en-noun-7XTpkL3R",
      "links": [
        [
          "manual",
          "manual"
        ],
        [
          "symmetric",
          "symmetric"
        ],
        [
          "encryption",
          "encryption"
        ],
        [
          "technique",
          "technique"
        ],
        [
          "encrypt",
          "encrypt"
        ],
        [
          "digraph",
          "digraph"
        ]
      ],
      "wikipedia": [
        "Charles Wheatstone",
        "Lord Playfair",
        "Playfair cipher"
      ]
    }
  ],
  "word": "Playfair cipher"
}

{
  "etymology_text": "Named after Lord Playfair, who promoted it. (It was invented in 1854 by Charles Wheatstone.)",
  "forms": [
    {
      "form": "Playfair ciphers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Playfair cipher (plural Playfair ciphers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English eponyms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "A manual symmetric encryption technique that encrypts pairs of letters (digraphs)."
      ],
      "links": [
        [
          "manual",
          "manual"
        ],
        [
          "symmetric",
          "symmetric"
        ],
        [
          "encryption",
          "encryption"
        ],
        [
          "technique",
          "technique"
        ],
        [
          "encrypt",
          "encrypt"
        ],
        [
          "digraph",
          "digraph"
        ]
      ],
      "wikipedia": [
        "Charles Wheatstone",
        "Lord Playfair",
        "Playfair cipher"
      ]
    }
  ],
  "word": "Playfair cipher"
}