What is another way of saying in particular?

Here are some alternatives to "in particular," depending on the specific context:

Emphasis:

* Specifically

* Especially

* Most importantly

* Above all

* Primarily

* Chiefly

Specificity:

* For example

* Such as

* To be precise

* More precisely

Focus:

* In this instance

* In this case

* With regard to

* Regarding

* Concerning

Informal:

* Especially

* Really

* Most of all

Example:

* Formal: "The project was successful, in particular the marketing campaign."

* Informal: "The project was successful, especially the marketing campaign."

The best alternative will depend on the specific meaning you want to convey.