ゆいいつ唯一yuiitsuゆいつ唯一yuitsu
1.

A condition in which there exists only one instance or example, with no alternatives or counterparts.

2.

The quality of being the singular choice or method available, emphasizing the absence of any substitutes.

3.

A descriptor for a situation or thing that stands alone, having no other similar entities beside it.

Example:

初めの一歩が唯一の難関。

ゆいいつむに唯一無二yuiitsumuniゆいつむに唯一無二yuitsumuni
1.

Describes something that is one of a kind and unmatched in its distinctiveness or value, indicating that there is nothing else like it in existence.

2.

Refers to a singular item or concept that cannot be replicated or found elsewhere, often invoking a sense of rarity or special significance.

3.

Characterizes an entity that stands out due to its exceptional qualities, making it irreplaceable or unparalleled in its category.

Example:

この地上で唯一無二の平等は死である。

しじょうゆいいつ史上唯一shijouyuiitsu
1.

A term used to signify something that has occurred just one time throughout all of recorded history, highlighting its unparalleled significance.

2.

A phrase that emphasizes the uniqueness of an event or instance, indicating that it has no equal or repetition in the annals of time.

3.

An expression that reflects the idea of being a singular historical occurrence, suggesting a moment or entity that stands alone in its importance and rarity.