tool Definition in the Cambridge English Dictionary
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Definition of “tool” - English Dictionary

Definition of "tool" - American English Dictionary

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toolnoun [C]

 us   /tul/
a ​piece of ​equipment that you use to ​help you do a ​job, esp. something that you use with ​yourhands to make or ​repair something: The only tools you need for this ​job are a ​hammer and a ​screwdriver. A tool is also anything that ​helps you to do something you ​want to do: We ​believe the new ​law will be an ​effective tool in ​fightingpoverty.
(Definition of tool from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "tool" - British English Dictionary

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toolnoun [C]

uk   us   /tuːl/

tool noun [C] (EQUIPMENT)

a ​piece of ​equipment that you use with ​yourhands to make or ​repair something: power tools machine tools something that ​helps you to do a ​particularactivity: A ​free low-interest ​creditcard can be a usefulbudgeting tool.tool of the trade A tool of the ​trade is something you need to use to do ​yourjob: The ​artist was ​surrounded by ​paints, ​brushes, and other tools of the ​trade.
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tool noun [C] (PERSON)

disapproving someone whose ​decisions and ​actions are ​unfairlycontrolled by ​others: The ​president was ​widelyregarded as the tool of the ​military.

tool noun [C] (PENIS)

offensive a penis offensive an ​insulting word for a ​person who you ​dislike very much or who ​behaves very ​stupidly
(Definition of tool from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)

Definition of "tool" - Business English Dictionary

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toolnoun [C]

uk   us   /tuːl/
a ​smallpiece of ​equipment that you use with your ​hands to make or ​repair something: They ​sellagriculturalmachinery and tools. You can ​assemble our furniture using hand tools or very basic power tools.
something that helps you in a particular ​activity: An educated ​salesforce is one of the most ​effective tools any ​company can have. Our ​online presence gives us a powerful new tool to ​maintainmarketposition. a business/​marketing/​research tool a strategic/​managerial/​statistical tool
IT a ​program or ​feature of a ​program that helps you do particular things on a ​computer: The ​spreadsheetprogramoffers several useful tools for ​manipulating the ​material. Companies in the ​industry tend to use identical, or at least ​compatible, software tools.
tool of the trade something that is necessary for doing a particular ​job: A ​personalcomputer and ​laptop are ​essential tools of the ​trade for any journalist. The ​ability to write clearly is another tool of the ​trade.
See also
(Definition of tool from the Cambridge Business English Dictionary © Cambridge University Press)
What is the pronunciation of tool?