"counterpropagating" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "counter",
        "3": "propagating"
      },
      "expansion": "counter- + propagating",
      "name": "prefix"
    }
  ],
  "etymology_text": "counter- + propagating",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "counterpropagating (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms prefixed with counter-",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Physics",
          "orig": "en:Physics",
          "parents": [
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Describing two beams of light that are propagating in precisely opposite directions through the same medium"
      ],
      "id": "en-counterpropagating-en-adj-0GQqfagw",
      "links": [
        [
          "physics",
          "physics"
        ],
        [
          "light",
          "light"
        ],
        [
          "propagating",
          "propagating"
        ],
        [
          "opposite",
          "opposite"
        ]
      ],
      "raw_glosses": [
        "(physics) Describing two beams of light that are propagating in precisely opposite directions through the same medium"
      ],
      "tags": [
        "not-comparable"
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ]
    }
  ],
  "word": "counterpropagating"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "counter",
        "3": "propagating"
      },
      "expansion": "counter- + propagating",
      "name": "prefix"
    }
  ],
  "etymology_text": "counter- + propagating",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "counterpropagating (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "English adjectives",
        "English entries with incorrect language header",
        "English lemmas",
        "English terms prefixed with counter-",
        "English uncomparable adjectives",
        "en:Physics"
      ],
      "glosses": [
        "Describing two beams of light that are propagating in precisely opposite directions through the same medium"
      ],
      "links": [
        [
          "physics",
          "physics"
        ],
        [
          "light",
          "light"
        ],
        [
          "propagating",
          "propagating"
        ],
        [
          "opposite",
          "opposite"
        ]
      ],
      "raw_glosses": [
        "(physics) Describing two beams of light that are propagating in precisely opposite directions through the same medium"
      ],
      "tags": [
        "not-comparable"
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ]
    }
  ],
  "word": "counterpropagating"
}