Approve. Praise, commend, sanction, support, encourage, authorize.
Ant. Disparage, condemn, disown, repudiate, dislike.
Approximation. Approach, nearness, similarity, likeness, contiguity, resemblance, propinquity, neighborhood.
Ant. Remoteness, variation, distance, difference, divergence.
Appurtenant. Belonging, connected, appended, attached, coordinate.
Ant. Isolated, detached, unallied, independent.
A priori. Theoretically; necessarily, apodictically, constitutionally, absolutely, primordially, inductively.
Ant. A posteriori; practically, according to experience; deductively from facts.
Apropos. Opportune, seasonable, apposite, timely, apt, suitable.
Ant. Inopportune, irrelevant, untimely, inapt, unsuitable.