complicit and axis

1) complicit = ?
2) axis = ?

Conctext:

iii) whilst some immune deficiency states are essentially monogenic, each of them can exhibit striking variability in autoimmune outcome, indicative of epigenetic or environmental influences on phenotypic expression;iv) innate immunity, particularly complement defects, as well as adaptive immunity, is complicit in the mmunodeficiency-autoimmunity axis;