"-sten" meaning in Finnish

{
  "etymology_templates": [
    {
      "args": {
        "1": "fi",
        "2": "-nen",
        "3": "ten"
      },
      "expansion": "-nen + -ten",
      "name": "suf"
    }
  ],
  "etymology_text": "Possibly equivalent to -nen + -ten.",
  "head_templates": [
    {
      "args": {
        "1": "fi",
        "2": "adverb"
      },
      "expansion": "-sten",
      "name": "head"
    }
  ],
  "lang": "Finnish",
  "lang_code": "fi",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Finnish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Finnish terms suffixed with -ten",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Synonym of -isin (temporal distributive)."
      ],
      "id": "en--sten-fi-adv-HgrSxvdN",
      "links": [
        [
          "-isin",
          "-isin#Finnish"
        ]
      ],
      "synonyms": [
        {
          "extra": "temporal distributive",
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "-isin"
        }
      ],
      "tags": [
        "dialectal"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/-sten/"
    },
    {
      "ipa": "[-s̠te̞n]"
    }
  ],
  "word": "-sten"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "fi",
        "2": "-nen",
        "3": "ten"
      },
      "expansion": "-nen + -ten",
      "name": "suf"
    }
  ],
  "etymology_text": "Possibly equivalent to -nen + -ten.",
  "head_templates": [
    {
      "args": {
        "1": "fi",
        "2": "adverb"
      },
      "expansion": "-sten",
      "name": "head"
    }
  ],
  "lang": "Finnish",
  "lang_code": "fi",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        "Finnish adverbs",
        "Finnish dialectal terms",
        "Finnish entries with incorrect language header",
        "Finnish lemmas",
        "Finnish terms suffixed with -ten",
        "Finnish terms with IPA pronunciation"
      ],
      "glosses": [
        "Synonym of -isin (temporal distributive)."
      ],
      "links": [
        [
          "-isin",
          "-isin#Finnish"
        ]
      ],
      "synonyms": [
        {
          "extra": "temporal distributive",
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "-isin"
        }
      ],
      "tags": [
        "dialectal"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/-sten/"
    },
    {
      "ipa": "[-s̠te̞n]"
    }
  ],
  "word": "-sten"
}