写定义英语作文时，可以遵循以下步骤和结构：

明确主题：

首先确定你要定义的对象或概念。例如，“成功”。

引入定义：

在开头部分简要介绍你要定义的对象，并指出其重要性。例如，“成功是每个人心中的追求，它可能有多种定义。”

具体定义：

详细阐述你对这个对象或概念的理解。可以从不同角度或方面进行描述。例如，“对于一些人来说，成功可能意味着获得高分；对于另一些人来说，成功可能是建立新友谊；甚至对于演讲者来说，成功可能是在台上自如地发表演讲。”

解释和说明：

进一步解释和说明你的定义，提供具体的例子或证据来支持你的观点。例如，“例如，在学术上，成功可能意味着发表了高质量的论文或获得了重要的研究资助。”

总结和强调：

在结尾部分总结你的定义，并强调其重要性。例如，“因此，成功是一个多维度的概念，它不仅仅是一个简单的目标，而是包含了个人价值观、目标和成就的综合体现。”

Title: My Definition of Success

Success is a multifaceted concept that varies from person to person. At its core, success is the achievement of one's goals and aspirations. However, what constitutes success can differ significantly from individual to individual.

For some, success might be measured by academic achievements, such as earning high grades or receiving prestigious awards. For others, it could be the establishment of meaningful relationships, making new friends or finding a life partner. Even public speaking or presenting oneself effectively can be seen as a form of success, as it involves communicating ideas clearly and persuasively.

Moreover, success can also be defined by personal growth and development. It is the process of overcoming challenges, learning from failures, and continuously improving oneself. This might involve pursuing hobbies, acquiring new skills, or simply becoming a better version of oneself.

In conclusion, success is a personal and subjective concept that encompasses a wide range of achievements and experiences. It is not merely about reaching a destination but rather about the journey and the growth that comes with it. Ultimately, success is what makes each individual feel fulfilled and content with their life.

希望这个示例能帮助你更好地理解如何写定义英语作文。