Actually, the definition is different than Wikipedia's.
Main Entry:
child
Pronunciation: \ˈchī(-ə

ld\
Function:
noun
Inflected Form(s):
plural chil·dren \ˈchil-drən, -dərn\
Usage:
often attributive
Etymology: Middle English, from Old English
cild; akin to Gothic
kilthei womb, and perhaps to Sanskrit
jaṭhara belly
Date: before 12th century
1 a : an unborn or recently born person
b dialect : a female infant
2 a : a young person especially between infancy and youth
b : a childlike or childish person
c : a person not yet of age
3usually
childe \ˈchī(-ə

ld\
archaic : a youth of noble birth
4 a : a son or daughter of human parents
b : descendant
5 : one strongly influenced by another or by a place or state of affairs
6 : product,
result <barbed wire…is truly a child of the plains — W. P. Webb>
—
child·less \ˈchī(-ə

l(d)-ləs\
adjective
—
child·less·ness noun
—
with child : pregnant
Child - Definition and More from the Free Merriam-Webster Dictionary
But keep spouting your erroneous one, it adds so much credibility to your opponents.
Rule of thumb for you in the future: If you have to lie to make your point, your point is probably wrong.