1. In time, Mr. Fleming's son graduated from a top medical school in London.

(What is the meaning of "In time"? What other expressions can we use?)

2. You have to come to the party in time.
(What about 'in time' here? What is the difference of 'in time' between in Sentence 1 and Sentence 2?)

1 answer

"In time" means "eventually" or "at an unspecified time in the futute."
http://www.answers.com/eventually
You could also say, "Eventually" or "After several years."

2. The phrase "in time" is not used correctly. It should be "on time" meaning at the correct time -- not late!