Understanding the Question: One Who is Preoccupied with His Own Interests

The question asks us to find a single word that accurately describes a person whose primary focus and concern are their own interests. This type of question is known as a one-word substitution, a common part of vocabulary and English language tests.

To answer this, we need to examine the meaning of each provided option and determine which one best fits the description "preoccupied with his own interests". Let's break down each term.

Analysing the Options for Preoccupied with Own Interests

• Optimist: An optimist is a person who is hopeful and confident about the future. They tend to see the good side of things. This is about a person's general outlook on life and the future, not specifically about being focused on their own interests. Therefore, 'Optimist' is not the correct word for someone preoccupied with their own interests.
• Pessimist: A pessimist is a person who tends to see the worst aspect of things or believes that the worst will happen. This is the opposite outlook to an optimist and is also about a general attitude towards life and outcomes, not about self-interest. So, 'Pessimist' does not fit the description of someone preoccupied with his own interests.
• Atheist: An atheist is a person who does not believe in the existence of God or gods. This term relates to religious or spiritual beliefs (or lack thereof). It has no connection to whether a person is preoccupied with their own interests. Hence, 'Atheist' is incorrect.
• Egoist: An egoist is a person who is excessively concerned with their own needs, wishes, or interests, and gives relatively little attention to others. The word 'ego' relates to the self, and an 'egoist' is someone centered on the self, often to the exclusion of others' concerns. Being "preoccupied with his own interests" perfectly matches the definition of an egoist.

Conclusion: Identifying the Correct Term

Based on the analysis of each option, the word that means the same as "One who is preoccupied with his own interests" is 'Egoist'. An egoist is fundamentally driven by self-interest and focuses primarily on their own well-being, desires, and advantages.

Revision Table: One-Word Substitutions

Additional Information: Related Concepts

Understanding related terms can further clarify the meaning of egoist and similar concepts:

• Egotist: Often confused with egoist, an egotist is a person who is excessively conceited or boastful, talking excessively about themselves. While related to the self, it focuses more on talking about oneself rather than purely acting out of self-interest, though the two often overlap.
• Altruist: An altruist is the opposite of an egoist. An altruist is a person who acts out of selfless concern for the well-being of others.
• Selfish: This is a more common term similar to egoist, describing someone lacking consideration for others; concerned chiefly with one's own personal profit or pleasure. 'Egoist' often implies a more philosophical or deep-seated focus on self, while 'selfish' is a broader term for self-centered behaviour.

Being able to distinguish between these words is crucial for vocabulary questions. The core meaning of 'egoist' aligns perfectly with the description of someone preoccupied with their own interests.