The Oxford Thesaurus An A-Z Dictionary of Synonyms - gravity n.

1) gravitation; attraction: After middle age, the body obeys the laws of gravity but not of mutual attraction. 2) seriousness, acuteness, immediacy, importance, significance, weight, magnitude, severity, urgency, exigency, momentousness, weightiness: When I saw mother's expression I realized the gravity of the situation. 3) solemnity, dignity, sombreness, staidness, sedateness, sobriety, gravitas, soberness, reserve; gloominess, grimness: The ceremony was conducted with suitable gravity.