noun
BAD : My object is to improve my English as much as possible.
GOOD : My objective is to improve my English as much as possible.
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object = the purpose of an action or event: 'The object of the game is to score as many points as possible.' 'Nobody knows the real object of their visit. They're keeping it a secret.'
objective = the thing that you are working towards and hope to achieve by the end of a course of action: 'The company's long-term objective is to increase sales overseas.' 'The course description began with a long list of aims and objectives.'