1. With, together, jointly: This is the most common meaning.
* Confer: to discuss something together
* Connect: to join things together
* Confront: to face someone or something directly
2. Against, opposite: This meaning is less common but still important.
* Contradict: to say the opposite of what someone else said
* Contrary: opposite in nature or direction
* Conflict: to clash or oppose
3. Completely, thoroughly: This meaning is sometimes used in informal speech.
* Convinced: completely sure of something
* Conquer: to defeat completely
4. Intensifier: This meaning adds emphasis or intensity to the word.
* Conspicuous: very noticeable
* Considerable: quite large or important
It's important to remember that the meaning of "con" can vary depending on the context and the word it's attached to.
If you're unsure of the meaning, look up the word in a dictionary!