Adjective only has 2 senses
  1. lone, lonesome, only, sole, solitary - being the only one; single and isolated from others; "the lone doctor in the entire county"; "a lonesome pine"; "an only child"; "the sole heir"; "the sole example"; "a solitary instance of cowardice"; "a solitary speck in the sky"
    Antonym: multiple (indirect, via single)
  2. alone, only - exclusive of anyone or anything else; "she alone believed him"; "cannot live by bread alone"; "I'll have this car and this car only"
    Antonym: inclusive (indirect, via exclusive)
,Adverbial only has 7 senses
  1. merely, simply, just, only, but - and nothing more; "I was merely asking"; "it is simply a matter of time"; "just a scratch"; "he was only a child"; "hopes that last but a moment"
  2. entirely, exclusively, solely, alone, only - without any others being included or involved; "was entirely to blame"; "a school devoted entirely to the needs of problem children"; "he works for Mr. Smith exclusively"; "did it solely for money"; "the burden of proof rests on the prosecution alone"; "a privilege granted only to him"
  3. only - with nevertheless the final result; "He arrived only to find his wife dead"; "We won only to lose again in the next round"
  4. only - in the final outcome; "These news will only make you more upset"
  5. only - except that; "It was the same story; only this time she came out better"
  6. only, only if, only when - never except when; "call me only if your cold gets worse"
  7. only - as recently as; "I spoke to him only an hour ago"