Based on your query, I would recommend using Semantic Scholar. This tool uses artificial intelligence to help users search and discover academic research, making it an excellent resource for finding comprehensive information on the definition of colonialism.

The key features of Semantic Scholar that could be particularly useful for your query include:

• TLDR Feature: This feature generates single-sentence summaries of academic papers, which could help you quickly identify relevant research on colonialism.
• Semantic Reader: This augmented reader provides in-line citation cards and skimming highlights, allowing you to quickly grasp the key points of a paper on colonialism.
• Free Access to Academic Papers: With over 200 million academic papers indexed from various fields of science, you're likely to find numerous resources on colonialism.

Remember, Semantic Scholar is free to use, making it a cost-effective solution for your research needs.