1. (

• apology

) an expression of regret at having caused trouble for someone; "he wrote a letter of apology to the hostess" ;

2. (

• apology ,
• apologia ,

) a formal written defense of something you believe in strongly ;

3. (

• apology ,
• excuse

) a poor example; "it was an apology for a meal"; "a poor excuse for an automobile" ;