Só, mas, unicamente, raro, somente, único, portanto.a.
One alone; single; as, the only man present; his only occupation.
Alone in its class; by itself; not associated with others of the same class or kind; as, an only child.
Hence, figuratively: Alone, by reason of superiority; preeminent; chief.
In one manner or degree; for one purpose alone; simply; merely; barely.
So and no otherwise; no other than; exclusively; solely; wholly.
Singly; without more; as, only-begotten.
Above all others; particularly.
Save or except (that); -- an adversative used elliptically with or without that, and properly introducing a single fact or consideration
lone, lonesome, sole, solitary, single similar term adj, alone, exclusive similar term adv, merely, simply, just, but adv, entirely, exclusively, solely, alone adv, only if, only when