Question: explain what the british understood by the term terra nullius
[{'answer': "nobody 's land", 'provenance': [{'wikipedia_id': '247874', 'title': 'Terra nullius', 'start_paragraph_id': 1, 'start_character': 73, 'end_paragraph_id': 1, 'end_character': 87, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '247874', 'title': 'Terra nullius', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 223, 'bleu_score': 0.683894941511475, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5604913964599767330}, 'section': 'Section::::Abstract.'}]}]