Implement /define command

[tanamaroby]

Issue Title: Implement /define Command

Issue Description: As a user of our Discord bot, I want to be able to use a "/define" command to look up the definition of a word from an online dictionary and receive the definition within Discord, so that I can quickly understand the meaning of unfamiliar words.

Feature Description:

• The "/define" command should take one argument, which is the word to be defined.
• When invoked, the bot should fetch the definition of the specified word from an online dictionary API.
• The bot's response should include the definition of the word.

Acceptance Criteria:

• The "/define" command is successfully implemented and tested.
• Invoking the "/define" command with a valid word argument should result in the bot fetching and displaying the definition of the word.
• The bot's response should include the definition of the word.

Additional Notes:

• This feature will provide users with a convenient way to look up the definitions of unfamiliar words within Discord.
• Please ensure thorough testing of the "/define" command functionality before closing this issue.