T.,
My first thought is to ask if your son is teething. All three of my children bit when they were teething. It would stop after the teeth came through and back again when more teething happened. Some teeth were worse than others. After they got all their teeth, the biting permanently stopped.
Regardless of the cause, I would not recommend biting back, especially at 14 months. They are too young to be doing this to be mean. At this age, they bite either out of frustration, because they are in pain or because they are curious (cause and effect is going to be very interesting to them for the next several months.)
Try and isolate when your child bites (is it when he is tired, frustrated, bored, hungry or otherwise dealing with difficult emotions?) If the timing is totally random, my guess is teeth. Get him teethers - you can try different sizes, temperatures and textures to find what he likes. Sometimes a cold or warm washcloth works. Pick your battles and if he wants to bite a shoe box or blanket or bedpost, let him. Give him pain killers if you have to. A little teething medicine or Tylonol won't hurt when the pain is really bad. (My daughter used to lay in the fetal position holding her jaw and screaming because of teething. It really can be unpleasant at times.)
Your son may also bite to get a reaction or attention from you. Sometimes just a flinch, an "ouch" or a sigh of frustration and roll of Mom's eyes is enough to make him want to do it again to test cause and effect. If this is the cause, don't make a big deal of it. If he bites you, pull him away and tell him "no" in a firm voice, but not with a lot of emotion. Then get up and walk away. (Don’t run back in to see his reaction.) If he bites other kids, get him away from them. Don't set him down and have a talk about how biting hurts. All he will learn is that biting is a good way to get your undivided attention. He can't understand others feelings at this age anyway. (If the child is older, have the discussion before they bite, not after. Include a warning that an unpleasant consequence will be immediately carried out if the behavior happens again, even once. Don't attach another long talk with the consequence.)
Chances are, if this behavior isn't inadvertently encouraged, it will end with teething.
Best of luck,
S.