as a correlative conjunction used to introduce a statement that is followed by a further, often stronger, statement

barely, merely, or nothing more than a certain amount, extent, or status

not only; not just

second only to; ranking behind only

not only that, but also; furthermore

the only remaining of the great; one of the few greats extant

for reference only

only for; provided for ... only

that's all; just this and nothing more

for reference only