1.  midterm(n = noun.time) - the middle of the gestation period;

2.  midterm(n = noun.time) - middle of an academic term or a political term in office;

3.  midterm(n = noun.communication) midterm exam, midterm examination - an examination administered in the middle of an academic term;

1.  the middle of the gestation period. [WordNet 1.5]

2.  The middle of an academic term or a political term in office. [WordNet 1.5]

3.  An examination given in the middle of an academic term; a midterm examination. [WordNet 1.5]