1. of, relating to, or characteristic of monotheism; believing in or advocating the worship of a single god
Usage: formal or literary; less common than 'monotheistic'

Examples

• The monotheistical traditions of Judaism, Christianity, and Islam share a common belief in one supreme deity.
• Early monotheistical movements challenged the polytheistic religions that dominated ancient societies.
• Her monotheistical worldview shaped her understanding of spirituality and morality.
• The scholar examined monotheistical doctrines across different cultures and time periods.
• Monotheistical religions have profoundly influenced Western civilization.