Notes. 1  For the purpose of this 1 in 5 statistic, Sun-like means G-type star. 2  For the purpose of this 1 in 5 statistic, Earth-sized means 1â2 Earth radii. 3  For the purpose of this 1 in 5 statistic, habitable zone means the region with 0.25 to 4 times Earth's stellar flux (corresponding to 0.5â2 AU for the Sun).
Wiktionary (0.00 / 0 votes) Rate this definition: nemesis (Noun). An archenemy. nemesis (Noun). A person or character who specifically brings about the downfall of another person or character. nemesis (Noun). The principle of retributive justice. nemesis (Noun).
1. antagonist. Opponent, competitor, rival refer to persons engaged in a contest. Opponent is the most impersonal, meaning merely one who opposes; perhaps one who continually blocks and frustrates or one who happens to be on the opposite side in a temporary contest: an opponent in a debate.