Argthtjtr

I'm doing research on manufacturing systems and throughout my papers I need to refer to events as they approach a line t=0 which is, to within a differential slice of time, the exact present between future and past, the dissecting line. Such a word would have quantum physicists turn in their graves due to relativity I know, but I think what it means is clear enough for English.

I've read that origo may mean what I want. It seems strange that such a word doesn't exist, and I've searched for weeks. I know the word 'now' sort of means that but it's ambiguous and still represents a spacious present.

In common everyday life there's been little need for an expression of the immediate (and constantly becoming past) instant of now, given that the moment it's expressed, that time-point has already ceased to be "now": it's become "just a moment ago" . The word that comes closest to expressing this concept is:

instantaneous

1. done, occurring, or acting without any perceptible duration of time
   
   
   
   
   • death was instantaneous
   
   
   
   


2. done without any delay being purposely introduced
   
   
   
   
   • took instantaneous corrective action
   
   
   
   


3. occurring or present at a particular instant
   
   
   
   
   • 
     instantaneous velocity
   
   
   
   

[Merriam-Webster Dictionary]

While I think all three definitions have relevance, the third definition would appear to be the most apt. An alternative source provides a similar definition:

2. [Physics]
   
   Existing or measured at a particular instant.
   
   
   
   
   • ‘measurement of the instantaneous velocity’
   
   
   
   

[Oxford Living Dictionaries]

Example sentence in the context of this question:

This metric analyses the instantaneous value of the parameter.

current

1 Belonging to the present time; happening or being used or done now.

A typical sentence might look like:

The equation is based on the current instantaneous value of the parameter (as at the time of measurement).

What about word beginning. Or you could add your own explanation/definition in the introduction part of your paper. For example: throughout this paper, I will refer to /your definition/ as initiation point/origo/origin/or something. Then you can always add note*(asterisk) with reference to definition, whenever this word appears in the text.