1. the absence or shortage of mental, emotional, or physical strain; a state of relaxation or ease
The lack of tension in the room made everyone feel more comfortable.
A falta de tensão na sala fez todos se sentirem mais à vontade.
2. in a technical or mechanical context, insufficient tightness or stress in a material or system
The lack of tension in the rope caused it to sag.
A falta de tensão na corda fez com que ela se pendurasse.