"start codon" meaning in English

{
  "etymology_text": "start (“indicating first, initial”) + codon",
  "forms": [
    {
      "form": "start codons",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "start codon (plural start codons)",
      "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": "Entries with translation boxes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Finnish translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Japanese translations",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "The codon at which translation of mRNA into protein starts, encoding the first amino acid."
      ],
      "id": "en-start_codon-en-noun-vRo5qHgG",
      "links": [
        [
          "codon",
          "codon"
        ],
        [
          "mRNA",
          "mRNA"
        ],
        [
          "protein",
          "protein"
        ],
        [
          "amino acid",
          "amino acid"
        ]
      ],
      "related": [
        {
          "word": "with an explanation of translation initiation in both prokaryote and eukaryote"
        }
      ],
      "synonyms": [
        {
          "word": "initiation codon"
        }
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "codon at which translation starts",
          "word": "aloituskodoni"
        },
        {
          "code": "ja",
          "lang": "Japanese",
          "roman": "kaishi-kodon",
          "sense": "codon at which translation starts",
          "word": "開始コドン"
        }
      ]
    }
  ],
  "word": "start codon"
}

{
  "etymology_text": "start (“indicating first, initial”) + codon",
  "forms": [
    {
      "form": "start codons",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "start codon (plural start codons)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "with an explanation of translation initiation in both prokaryote and eukaryote"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Entries with translation boxes",
        "Pages with 1 entry",
        "Pages with entries",
        "Terms with Finnish translations",
        "Terms with Japanese translations"
      ],
      "glosses": [
        "The codon at which translation of mRNA into protein starts, encoding the first amino acid."
      ],
      "links": [
        [
          "codon",
          "codon"
        ],
        [
          "mRNA",
          "mRNA"
        ],
        [
          "protein",
          "protein"
        ],
        [
          "amino acid",
          "amino acid"
        ]
      ]
    }
  ],
  "synonyms": [
    {
      "word": "initiation codon"
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "codon at which translation starts",
      "word": "aloituskodoni"
    },
    {
      "code": "ja",
      "lang": "Japanese",
      "roman": "kaishi-kodon",
      "sense": "codon at which translation starts",
      "word": "開始コドン"
    }
  ],
  "word": "start codon"
}