"off-by-one error" meaning in English

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      "expansion": "off-by-one error (plural off-by-one errors)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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          "langcode": "en",
          "name": "Programming",
          "orig": "en:Programming",
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        {
          "ref": "2005, Harvey M. Deitel, Paul J. Deitel, C# for Programmers, second edition, Prentice Hall Professional, →ISBN, page 164:",
          "text": "Using an incorrect relational operator or an incorrect final value of a loop counter in the loop-continuation condition of a repetition statement causes an off-by-one error.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A logic error where a value, typically the number of iterations of a loop, is specified incorrectly, being either 1 less or 1 more than it should be."
      ],
      "id": "en-off-by-one_error-en-noun-CTMZAowm",
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        [
          "logic error",
          "logic error"
        ],
        [
          "iteration",
          "iteration"
        ],
        [
          "loop",
          "loop"
        ]
      ],
      "raw_glosses": [
        "(programming) A logic error where a value, typically the number of iterations of a loop, is specified incorrectly, being either 1 less or 1 more than it should be."
      ],
      "related": [
        {
          "word": "fencepost problem"
        }
      ],
      "synonyms": [
        {
          "word": "off-by-one bug"
        },
        {
          "word": "OBOE"
        },
        {
          "word": "OBO"
        }
      ],
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  "word": "off-by-one error"
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      "tags": [
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "fencepost problem"
    }
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          "ref": "2005, Harvey M. Deitel, Paul J. Deitel, C# for Programmers, second edition, Prentice Hall Professional, →ISBN, page 164:",
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      ],
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        "A logic error where a value, typically the number of iterations of a loop, is specified incorrectly, being either 1 less or 1 more than it should be."
      ],
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      "raw_glosses": [
        "(programming) A logic error where a value, typically the number of iterations of a loop, is specified incorrectly, being either 1 less or 1 more than it should be."
      ],
      "synonyms": [
        {
          "word": "off-by-one bug"
        },
        {
          "word": "OBOE"
        },
        {
          "word": "OBO"
        }
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