"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": "Entries with collapsible category trees for nonexistent categories",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages using catfix",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 3 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "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 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 unproductive prefixes",
        "Entries with collapsible category trees for nonexistent categories",
        "Pages using catfix",
        "Pages with 3 entries",
        "Pages with entries"
      ],
      "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-"
}