Thanks for writing back. 

If I try

emacs -Q -fn Input

I get Emacs to open with Input as the default font just fine. 



I’ve been using Input with Emacs for over two years without any trouble. In what sense is Emacs rejecting it? 

> On Oct 6, 2022, at 1:27 PM, Eli Zaretskii <eliz@gnu.org> wrote:
> 
>> From: Alejandro Pérez Carballo <apc@umass.edu>
>> Date: Thu, 06 Oct 2022 08:38:09 -0400
>> 
>> I tried calling `dictionary` (just `M-x dictionary RET`) and got the following error:
>> 
>>    set-face-attribute: Font not available: #<font-spec nil nil default nil nil nil nil nil nil nil nil nil ((:name . "default") (:user-spec . "default"))>
>> 
>> I do not get this error if I simply run `emacs -Q` and then call `dictionary`. But adding just
>> 
>>    (set-face-attribute 'default nil :font "Input")
>> 
>> suffices to reproduce the error on my system (after calling `emacs -Q -l file.el`, where 'file.el' contains just that one line).
> 
> What happens if you invoke Emacs like this:
> 
>  emacs -Q -fn Input
> 
> I suspect that Input font is not good for Emacs, so it rejects it.
> 
> Nevertheless, I think the definition of
> dictionary-word-definition-face is problematic: it shouldn't use font
> names such as "default", because it will always fail like this:
> 
>> Debugger entered--Lisp error: (error "Font not available" #<font-spec
>>  nil nil default nil nil nil nil nil nil nil nil nil ((:name .
>>  "default") (:user-spec . "default"))>)