1. a particular point in time, a decision-making point
important/significant/crucial juncture in life/career
A 'juncture' is a place or moment where things join or a particular event in time. You can say: 'At this juncture, we cannot predict the outcome of the case' for example. You might say "We have reached an important juncture in the talks." to refer to an important crossroads or point in time. "The performance intersects at the juncture of dance and theatre." This sentence would mean that the performance has elements of dance and theatre that cross over at different points. Similar in meaning to: at a crossroads.