"imperfective aspect" meaning in Английский

{
  "antonyms": [
    {
      "sense_index": 1,
      "word": "perfective aspect"
    }
  ],
  "categories": [
    {
      "kind": "other",
      "name": "Английский язык",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Требуется категоризация/en",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Устойчивые сочетания/en",
      "parents": [],
      "source": "w"
    }
  ],
  "hypernyms": [
    {
      "sense_index": 1,
      "word": "grammatical aspect"
    }
  ],
  "lang": "Английский",
  "lang_code": "en",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Грамматика/en",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "несовершенный вид"
      ],
      "id": "ru-imperfective_aspect-en-phrase-Js5i1bJW",
      "raw_tags": [
        "грам."
      ]
    }
  ],
  "word": "imperfective aspect"
}

{
  "antonyms": [
    {
      "sense_index": 1,
      "word": "perfective aspect"
    }
  ],
  "categories": [
    "Английский язык",
    "Требуется категоризация/en",
    "Устойчивые сочетания/en"
  ],
  "hypernyms": [
    {
      "sense_index": 1,
      "word": "grammatical aspect"
    }
  ],
  "lang": "Английский",
  "lang_code": "en",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        "Грамматика/en"
      ],
      "glosses": [
        "несовершенный вид"
      ],
      "raw_tags": [
        "грам."
      ]
    }
  ],
  "word": "imperfective aspect"
}