Reap vs Undefined - What's the difference?

As a verb reap

is to cut with a sickle, scythe, or reaping machine, as grain; to gather, as a harvest, by cutting.

is a bundle of grain; a handful of grain laid down by the reaper as it is cut.

lacking a definition or value.

To cut with a sickle, scythe, or reaping machine, as grain; to gather, as a harvest, by cutting.

* Bible, Leviticus

When ye reap the harvest of your land, thou shalt not wholly reap the corners of thy field.

To gather; to obtain; to receive as a reward or harvest, or as the fruit of labor or of works, in a good or a bad sense.

to reap a benefit from exertions

* Milton

Why do I humble thus myself, and, suing / For peace, reap nothing but repulse and hate?

* (Bible) Epistle to the Galatians, ch. 6, v.7

For whatever a man is sowing, this he will also reap. Gal.6.7

(computer science) To terminate a child process that has previously exited, thereby removing it from the process table.

Until a child process is reaped , it may be listed in the process table as a zombie or defunct process.

(obsolete) To deprive of the beard; to shave.

(Shakespeare)

* reaper * reap what one sows *

(en noun)

A bundle of grain; a handful of grain laid down by the reaper as it is cut.

(wikipedia undefined) (-)

Lacking a definition or value.

(mathematics, computing) That does not have a meaning and is thus not assigned an interpretation.

The result of division by zero is undefined .

* defined