If you have a definite purpose in mind, get to the point promptly.

如果你心里有明确的意图, 就干脆说出来.

《简明英汉词典》

The Lord Jesus certainly spoke this word with a definite purpose.

主耶稣说这话的确有明确的目的.

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They serve a definite purpose in the overall traffic pattern.

这种单向式的车流,对整体的交通运作当然有一定的作用.

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He sometimes just opened the book at random, without any definite purpose.

有时他只是毫无目的地随意翻开书本.

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