pertinent - Dictionary definition and meaning for word pertinent
relate to pertaining....which means relevant to
can brake into pert(read like part)+in it. to take part in. it(something) must be suitable.
party in a tent is suitable
pertinant sounds like relevant
PER(perk)+TINE(tiny)+NT(not)....TINY PERKS are not SUITABLE.
The parts(pert) in(in) ent(ear,nose,teeth) is always important