An only child.
Alone in a category.
Singularly superior; the best.
Without sibling; without a sibling of the same gender.
As recently as.
Without others or anything further; exclusively.
Used to express surprise or consternation at an action.
Introduces a disappointing or surprising outcome that renders futile something previously mentioned.
No more than; just.
Under the condition that; but.
But; except.
(of an experiment or procedure) That gives different results when repeated
Unable to be repeated