"t/m" meaning in All languages combined

{
  "categories": [
    {
      "kind": "other",
      "name": "有1個詞條的頁面",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "有詞條的頁面",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "荷蘭語副詞",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "荷蘭語詞元",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "荷蘭語",
  "lang_code": "nl",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "荷蘭語首字母縮略詞",
          "parents": [],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "word": "tot en met"
        }
      ],
      "glosses": [
        "tot en met之首字母縮略詞。"
      ],
      "id": "zh-t/m-nl-adv-OJFzVv5T",
      "tags": [
        "form-of"
      ]
    }
  ],
  "word": "t/m"
}

{
  "categories": [
    "有1個詞條的頁面",
    "有詞條的頁面",
    "荷蘭語副詞",
    "荷蘭語詞元"
  ],
  "lang": "荷蘭語",
  "lang_code": "nl",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        "荷蘭語首字母縮略詞"
      ],
      "form_of": [
        {
          "word": "tot en met"
        }
      ],
      "glosses": [
        "tot en met之首字母縮略詞。"
      ],
      "tags": [
        "form-of"
      ]
    }
  ],
  "word": "t/m"
}