"-asseris" meaning in Latin

{
  "forms": [
    {
      "form": "-āsseris",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "la",
        "2": "suffix form",
        "head": "-āsseris"
      },
      "expansion": "-āsseris",
      "name": "head"
    }
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Latin entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Old Latin",
          "parents": [],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "extra": "first conjugation",
          "word": "-ō"
        }
      ],
      "glosses": [
        "second-person singular sigmatic future passive indicative of -ō (first conjugation)"
      ],
      "id": "en--asseris-la-suffix-7KoPnSYQ",
      "links": [
        [
          "-ō",
          "-o#Latin"
        ]
      ],
      "raw_glosses": [
        "(Old Latin, rare) second-person singular sigmatic future passive indicative of -ō (first conjugation)"
      ],
      "tags": [
        "Old-Latin",
        "form-of",
        "future",
        "indicative",
        "morpheme",
        "passive",
        "rare",
        "second-person",
        "sigmatic",
        "singular"
      ]
    }
  ],
  "word": "-asseris"
}

{
  "forms": [
    {
      "form": "-āsseris",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "la",
        "2": "suffix form",
        "head": "-āsseris"
      },
      "expansion": "-āsseris",
      "name": "head"
    }
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        "Latin entries with incorrect language header",
        "Latin non-lemma forms",
        "Latin rare terms",
        "Latin suffix forms",
        "Old Latin"
      ],
      "form_of": [
        {
          "extra": "first conjugation",
          "word": "-ō"
        }
      ],
      "glosses": [
        "second-person singular sigmatic future passive indicative of -ō (first conjugation)"
      ],
      "links": [
        [
          "-ō",
          "-o#Latin"
        ]
      ],
      "raw_glosses": [
        "(Old Latin, rare) second-person singular sigmatic future passive indicative of -ō (first conjugation)"
      ],
      "tags": [
        "Old-Latin",
        "form-of",
        "future",
        "indicative",
        "morpheme",
        "passive",
        "rare",
        "second-person",
        "sigmatic",
        "singular"
      ]
    }
  ],
  "word": "-asseris"
}