One way to hold technicality: take the cover off a machine and look at the small pieces inside. Those pieces are real and they do the work, but they are not what the machine is for, and most people never look at them. The word names one of those small inside pieces — and the interesting part is what happens when a small piece turns out to decide everything.
可以想成把一台機器的外殼掀開，看見裡面那些小零件。那些零件是真的在運作，但它們不是這台機器的目的，大部分人一輩子也不會去看。technicality 指的就是其中一個小零件。有趣的地方在後面：當其中一個小零件突然決定了整件事的結果，這個字就換了一種味道。
From the word’s history
From technical + -ity, the suffix that turns an adjective into a noun.
來源可以想成 technical 加上 -ity。-ity 是把形容詞變成名詞的字尾，像 real→reality、able→ability。所以字面就是「屬於內行那一塊的東西」，也就是外行人不會去看的那些小零件。
Wiktionary entry for technicality (kaikki extract, source_ref kaikki:3f6f69a190036ae4:547679742): "From technical + -ity."
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