I wish I had not set a bounty for this, because I stumbled upon the answer a few days later and it is really simple.
Here is URL to call if you want a definition to love:
http://www.google.com/dictionary/json?callback=a&sl=en&tl=en&q=love
You will get a response stream containing JSONP, with the following contents ("prettified" for learning purposes, API returns all in one line):
a(
{
"query":"love",
"sourceLanguage":"en",
"targetLanguage":"en",
"primaries":[
{
"type":"headword",
"terms":[
{
"type":"text",
"text":"love",
"language":"en",
"labels":[
{
"text":"Noun",
"title":"Part-of-speech"
}
]
},
{
"type":"phonetic",
"text":"/lé?v/",
"language":"und"
},
{
"type":"sound",
"text":"http://www.gstatic.com/dictionary/static/sounds/de/0/love.mp3",
"language":"und"
}
],
"entries":[
{
"type":"related",
"terms":[
{
"type":"text",
"text":"loves",
"language":"und",
"labels":[
{
"text":"plural"
}
]
}
]
},
{
"type":"meaning",
"terms":[
{
"type":"text",
"text":"An intense feeling of deep affection",
"language":"en"
}
],
"entries":[
{
"type":"example",
"terms":[
{
"type":"text",
"text":"babies fill parents with intense feelings of x3cemx3elovex3c/emx3e",
"language":"en"
}
]
},
{
"type":"example",
"terms":[
{
"type":"text",
"text":"their x3cbx3ex3cemx3elovex3c/emx3e forx3c/bx3e their country",
"language":"en"
}
]
}
]
},
{
"type":"meaning",
"terms":[
{
"type":"text",
"text":"A deep romantic or sexual attachment to someone",
"language":"en"
}
],
"entries":[
{
"type":"example",
"terms":[
{
"type":"text",
"text":"it was x3cemx3elovex3c/emx3e at first sight",
"language":"en"
}
]
},
{
"type":"example",
"terms":[
{
"type":"text",
"text":"they were both x3cbx3ein x3cemx3elovex3c/emx3e withx3c/bx3e her",
"language":"en"
}
]
},
{
"type":"example",
"terms":[
{
"type":"text",
"text":"we were slowly x3cbx3efalling in x3cemx3elovex3c/emx3ex3c/bx3e",
"language":"en"
}
]
}
]
},
{
"type":"meaning",
"terms":[
{
"type":"text",
"text":"A personified figure of x3cemx3elovex3c/emx3e, often represented as Cupid",
"language":"en"
}
]
},
{
"type":"meaning",
"terms":[
{
"type":"text",
"text":"A great interest and pleasure in something",
"language":"en"
}
],
"entries":[
{
"type":"example",
"terms":[
{
"type":"text",
"text":"his x3cbx3ex3cemx3elovex3c/emx3e forx3c/bx3e football",
"language":"en"
}
]
},
{
"type":"example",
"terms":[
{
"type":"text",
"text":"we share a x3cbx3ex3cemx3elovex3c/emx3e ofx3c/bx3e music",
"language":"en"
}
]
}
]
},
{
"type":"meaning",
"terms":[
{
"type":"text",
"text":"Affectionate greetings conveyed to someone on onex27s behalf",
"language":"en"
}
]
},
{
"type":"meaning",
"terms":[
{
"type":"text",
"text":"A formula for ending an affectionate letter",
"language":"en"
}
],
"entries":[
{
"type":"example",
"terms":[
{
"type":"text",
"text":"take care, lots of x3cemx3elovex3c/emx3e, Judy",
"language":"en"
}
]
}
]
},
{
"type":"meaning",
"terms":[
{
"type":"text",
"text":"A person or thing that one x3cemx3elovesx3c/emx3e",
"language":"en"
}
],
"entries":[
{
"type":"example",
"terms":[
{
"type":"text",
"text":"she was x3cbx3ethe x3cemx3elovex3c/emx3e of his lifex3c/bx3e",
"language":"en"
}
]
},
{
"type":"example",
"terms":[
{
"type":"text",
"text":"their two great x3cemx3elovesx3c/emx3e are tobacco and whiskey",
"language":"en"
}
]
}
]
},
{
"type":"meaning",
"terms":[
{
"type":"text",
"text":"A friendly form of address",
"language":"en"
}
],
"entries":[
{
"type":"example",
"terms":[
{
"type":"text",
"text":"itx27s all right, x3cemx3elovex3c/emx3e",
"language":"en"
}
]
}
]
},
{
"type":"meaning",
"terms":[
{
"type":"text",
"text":"Used to express affectionate approval for someone",
"language":"en"
}
],
"entries":[
{
"type":"example",
"terms":[
{
"type":"text",
"text":"donx27t fret, therex27s a x3cemx3elovex3c/emx3e",
"language":"en"
}
]
}
]
},
{
"type":"meaning",
"terms":[
{
"type":"text",
"text":"(in tennis, squash, and some other sports) A score of zero; nil",
"language":"en"
}
],
"entries":[
{
"type":"example",
"terms":[
{
"type":"text",
"text":"x3cemx3elovex3c/emx3e fifteen",
"language":"en"
}
]
},
{
"type":"example",
"terms":[
{
"type":"text",
"text":"he was down two sets to x3cemx3elovex3c/emx3e",
"language":"en"
}
]
}
]
}
]
},
{
"type":"headword",
"terms":[
{
"type":"text",
"text":"love",
"language":"en",
"labels":[
{
"text":"Verb",
