"at a time" meaning in Anglais

{
  "antonyms": [
    {
      "word": "separately"
    }
  ],
  "categories": [
    {
      "kind": "other",
      "name": "Compositions en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Locutions adverbiales en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Anglais",
      "orig": "anglais",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Composé de at, a et time."
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "adv",
  "pos_title": "Locution adverbiale",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Exemples en anglais",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Exemples en anglais à traduire",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "Mark Lutz, Learning Python (5ème édition),O'Reilly, 2013, page 123",
          "text": "In a nutshell, an object is iterable if it is either a physically stored sequence in memory, or an object that generates one item at a time in the context of an iteration operation—a sort of \"virtual\" sequence."
        }
      ],
      "glosses": [
        "À la fois, simultanément, en une fois, d’une traite."
      ],
      "id": "fr-at_a_time-en-adv-munkhtx3"
    }
  ],
  "synonyms": [
    {
      "word": "at a stretch"
    },
    {
      "word": "at once"
    },
    {
      "word": "in a row"
    },
    {
      "word": "simultaneously"
    }
  ],
  "tags": [
    "invariable"
  ],
  "word": "at a time"
}

{
  "antonyms": [
    {
      "word": "separately"
    }
  ],
  "categories": [
    "Compositions en anglais",
    "Locutions adverbiales en anglais",
    "anglais"
  ],
  "etymology_texts": [
    "Composé de at, a et time."
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "adv",
  "pos_title": "Locution adverbiale",
  "senses": [
    {
      "categories": [
        "Exemples en anglais",
        "Exemples en anglais à traduire"
      ],
      "examples": [
        {
          "ref": "Mark Lutz, Learning Python (5ème édition),O'Reilly, 2013, page 123",
          "text": "In a nutshell, an object is iterable if it is either a physically stored sequence in memory, or an object that generates one item at a time in the context of an iteration operation—a sort of \"virtual\" sequence."
        }
      ],
      "glosses": [
        "À la fois, simultanément, en une fois, d’une traite."
      ]
    }
  ],
  "synonyms": [
    {
      "word": "at a stretch"
    },
    {
      "word": "at once"
    },
    {
      "word": "in a row"
    },
    {
      "word": "simultaneously"
    }
  ],
  "tags": [
    "invariable"
  ],
  "word": "at a time"
}