Definitions:

1. as recently as adverb
   • I spoke to them only an hour ago.
2. in the final outcome adverb
   • These news will only make you more upset
3. never except when adverb
   • call me only if your cold gets worse
4. with nevertheless the final result adverb
   • I arrived on time only to find the bus had already left.

Synonyms:

• alone
• entirely
• just
• only if
• sole