"apology" in the noun sense
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"
Source: WordNet® (An amazing lexical database of English)
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