Relating to or caused by gravity; gravitational (a rare or technical variant of 'gravitational').
From Latin 'gravis' (heavy, weighty) plus the adjectival suffix '-ic'. This is an archaic or highly technical variant; 'gravitational' is the modern standard.
Latin 'gravis' gives us a whole family of heavy-sounding words: 'grave,' 'gravity,' 'gravid,' and even 'aggravate'—English speakers internalize that 'gr' words often feel serious.
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