"pur-" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "enm",
        "3": "pur-"
      },
      "expansion": "Middle English pur-",
      "name": "inh"
    },
    {
      "args": {
        "1": "en",
        "2": "xno",
        "3": "pur-"
      },
      "expansion": "Anglo-Norman pur-",
      "name": "der"
    },
    {
      "args": {
        "1": "fr",
        "2": "pour"
      },
      "expansion": "French pour",
      "name": "m+"
    },
    {
      "args": {
        "1": "en",
        "2": "la",
        "3": "prō-",
        "t": "forward direction, forward movement"
      },
      "expansion": "Latin prō- (“forward direction, forward movement”)",
      "name": "der"
    },
    {
      "args": {
        "1": "en",
        "2": "pro-"
      },
      "expansion": "Doublet of pro-",
      "name": "doublet"
    }
  ],
  "etymology_text": "From Middle English pur-, from Anglo-Norman pur- (compare modern French pour), from Latin prō- (“forward direction, forward movement”). Doublet of pro-.",
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "prefix",
        "head": "",
        "sort": ""
      },
      "expansion": "pur-",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "pur-",
      "name": "en-prefix"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prefix",
  "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 entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "pur- + blind → purblind",
          "type": "example"
        },
        {
          "text": "pur- + chase → purchase",
          "type": "example"
        },
        {
          "text": "pur- + port → purport",
          "type": "example"
        },
        {
          "text": "pur- + sue (“(obsolete) to follow”) → pursue",
          "type": "example"
        }
      ],
      "glosses": [
        "In words borrowed through Anglo-Norman: involving forward movement or completeness."
      ],
      "id": "en-pur--en-prefix-Vo4eaWZ~",
      "links": [
        [
          "Anglo-Norman",
          "Anglo-Norman#Proper noun"
        ],
        [
          "movement",
          "movement#Noun"
        ],
        [
          "completeness",
          "completeness#Noun"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "pur-"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "enm",
        "3": "pur-"
      },
      "expansion": "Middle English pur-",
      "name": "inh"
    },
    {
      "args": {
        "1": "en",
        "2": "xno",
        "3": "pur-"
      },
      "expansion": "Anglo-Norman pur-",
      "name": "der"
    },
    {
      "args": {
        "1": "fr",
        "2": "pour"
      },
      "expansion": "French pour",
      "name": "m+"
    },
    {
      "args": {
        "1": "en",
        "2": "la",
        "3": "prō-",
        "t": "forward direction, forward movement"
      },
      "expansion": "Latin prō- (“forward direction, forward movement”)",
      "name": "der"
    },
    {
      "args": {
        "1": "en",
        "2": "pro-"
      },
      "expansion": "Doublet of pro-",
      "name": "doublet"
    }
  ],
  "etymology_text": "From Middle English pur-, from Anglo-Norman pur- (compare modern French pour), from Latin prō- (“forward direction, forward movement”). Doublet of pro-.",
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "prefix",
        "head": "",
        "sort": ""
      },
      "expansion": "pur-",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "pur-",
      "name": "en-prefix"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prefix",
  "senses": [
    {
      "categories": [
        "English doublets",
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English lemmas",
        "English prefixes",
        "English terms derived from Anglo-Norman",
        "English terms derived from Latin",
        "English terms derived from Middle English",
        "English terms inherited from Middle English",
        "English terms with non-redundant non-automated sortkeys",
        "English unproductive prefixes"
      ],
      "examples": [
        {
          "text": "pur- + blind → purblind",
          "type": "example"
        },
        {
          "text": "pur- + chase → purchase",
          "type": "example"
        },
        {
          "text": "pur- + port → purport",
          "type": "example"
        },
        {
          "text": "pur- + sue (“(obsolete) to follow”) → pursue",
          "type": "example"
        }
      ],
      "glosses": [
        "In words borrowed through Anglo-Norman: involving forward movement or completeness."
      ],
      "links": [
        [
          "Anglo-Norman",
          "Anglo-Norman#Proper noun"
        ],
        [
          "movement",
          "movement#Noun"
        ],
        [
          "completeness",
          "completeness#Noun"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "pur-"
}