The power, degree, or capacity of something to attract; the measure of how strongly something draws or appeals to something else.
Formed from 'attract' plus the suffix '-ance' (from Latin '-antia'), which creates abstract nouns describing qualities or states. This suffix is related to '-ence' and became common in scientific and formal terminology.
Ecologists and entomologists use 'attractance' to measure literally how much a pheromone or visual stimulus attracts insects—it's a quantifiable scientific property now, showing how -ance' suffixes create nouns for things you can measure and compare.
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