Apologies if this has already been answered but I couldn\'t find any duplicates.
Is it possible to set font sizes on a per-token basis in Sublime Text 2? For example
Unfortunately, this is not possible, as there are no directives in the API or in color schemes for dealing with font size at that level of granularity.
However, it is possible to provide additional highlighting to your color scheme (.tmTheme file) so that function definitions stand out. It looks like you're using Monokai, so open Packages/Color Scheme - Default/Monokai.tmTheme and add the following to the end, just before the final :
name
Function definition
scope
meta.function
settings
background
#000080
This will highlight your function definition lines in a dark blue:

It also works for alternate function definition syntaxes:

Good luck!