Excursus

[ek-skur-suh s] /ɛkˈskɜr səs/

noun, plural excursuses, excursus.
1.
a detailed discussion of some point in a book, especially one added as an appendix.
2.
a digression or incidental excursion, as in a narrative.
/ɛkˈskɜːsəs/
noun (pl) -suses, -sus
1.
an incidental digression from the main topic under discussion or from the main story in a narrative

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Excusable
[verb ik-skyooz; noun ik-skyoos] /verb ɪkˈskyuz; noun ɪkˈskyus/ verb (used with object), excused, excusing. 1. to regard or judge with forgiveness or indulgence; pardon or forgive; overlook (a fault, error, etc.): Excuse his bad manners. 2. to offer an apology for; seek to remove the blame of: He excused his absence by saying that he […]

Excusal
[verb ik-skyooz; noun ik-skyoos] /verb ɪkˈskyuz; noun ɪkˈskyus/ verb (used with object), excused, excusing. 1. to regard or judge with forgiveness or indulgence; pardon or forgive; overlook (a fault, error, etc.): Excuse his bad manners. 2. to offer an apology for; seek to remove the blame of: He excused his absence by saying that he […]
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[ik-skyoo-zuh-tawr-ee, -tohr-ee] /ɪkˈskyu zəˌtɔr i, -ˌtoʊr i/ adjective 1. serving or intended to . /ɪkˈskjuːzətərɪ; -trɪ/ adjective 1. tending to or intended to excuse; apologetic