imperfection im‧per‧fec‧tion [ˌɪmpəˈfekʆn ǁ -pər-] noun [countable]
something that is not completely correct or perfect in a system, product etc; = FLAW:
• The CD had several small imperfections.
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imperfection UK US /ˌɪmpəˈfekʃən/ noun [C]
► PRODUCTION a fault in something that means that it is not perfect: an imperfection in sth »
The company manufactures pads used to smooth imperfections in computer chips.
Financial and business terms. 2012.