1. the branch of theology concerned with the defense or proof of Christianity
Usage: theology; often capitalized when referring to Christian apologetics specifically
2. systematic argumentative discourse in defense of a doctrine, theory, or institution
Usage: formal; can apply to non-religious contexts

Examples

• He studied Christian apologetics to better defend his faith.
• The professor taught a course on apologetics and theology.
• Her book on apologetics addressed common criticisms of religious belief.
• The seminary offered advanced classes in apologetics.
• Modern apologetics uses both philosophical and scientific arguments.
• The apologetics movement gained momentum in the 20th century.