Lam yulad, i.e. not begotten…
To be begotten from something, means to have originated from another being with the structural qualities of this being. This is the general usage of this word.
So if Allah is not begotten it clearly means that Allah did not originate from another being!
How can Allah have originated by another being if Allah is AHAD?
Allah is the infinite, limitless, indivisible ONE and ONLY.
To be able to think of another being from which Allah can originate, Allah must first have defined dimensions and parameters, such that we can ascertain His limits in order to determine the location of this other being.
ALLAH is AHAD. He is limitless, infinite and indivisible. He does not end at which point another being can begin.
As such, it is not possible for Allah to have originated from another being.
This is what lam yalud means.
The following verse “lam yakun lahu kufuwan ahad” can be interpreted as:
There is none like unto Him, within the micro or the macrocosm, nothing is in the likeness of the AHAD.
This is confirmed by the following verse once again:
“There is nothing that resembles Him!” (Quran 42:11)