Side/saɪd/ Definition 1 of 6Pro Tip 1/3Physical Orientation Refers to an actual physical direction relative to someone or something's position. Stand at my side while we wait. Pro Tip 2/3Support and Comfort Used to express closeness and support by staying physically close. During the scary movie, she stayed by my side. Pro Tip 3/3Next to Each Other 'Side by side' suggests close proximity without anything in between. They walked side by side in silence.