noun
five generations
Refers to a span of five generations in a family or lineage.
この家系は五世にわたって医者を続けている。
This family has produced doctors for five generations.
noun
fifth-generation immigrant; gosei
Specifically used for Japanese-American or other diaspora contexts to denote the fifth generation since immigration.
彼は日系五世としてアメリカで生まれ育った。
He was born and raised in the U.S. as a fifth-generation Japanese-American.
noun
the fifth (in a regnal name)
Used after a name to indicate the fifth holder of a title, such as a monarch or pope.
ジョージ五世はイギリス国王だった。
George V was the King of the United Kingdom.
三世 is third-generation (sansei); 五世 is two generations later.
四世 is fourth-generation (yonsei); 五世 is the next generation.
五 (five) + 世 (generation, world). The reading ごせい is the on'yomi combination.