i have delited safari from my mac. how can i install it back?

Download it from here:

https://support.apple.com/downloads/

Ciao.

If you have another browser you can use the download link. If not,go to the restore partition and reinstall the operating system. You do not have to erase and install as it only installs the operating system again. If you download it, make sure you get the safari for your operating system.

What version of the OS are you using? Restore it from a backup.

Safari 5.1.10 for Snow Leopard

Safari 8.0.4 for 10.10

http://swcdn.apple.com/content/downloads/53/38/031-17831/xm6yjkk13e2axuwutxeq0zs n2s2ppt34d8/Safari8.0.4Yosemite.pkg