noun

• (countable) A firmly held belief.
  ""...I imagined...that the husband of the lady might very easily be in Russia while his wife's health might necessitate her wintering in Egypt..." "But my mother thinks not. My mother thinks there is not a husband at all,—that there never was a husband. In fact my mother has very strong convictions on the subject...""
• (countable) A judgement of guilt in a court of law.
  "He said Robins had not been in trouble with the law before and had no previous convictions. Jail would have an adverse effect on her and her three children as she was the main carer."
• (uncountable) The state of being wholly convinced.
  "Analogies are used in aid of Conviction: Metaphors, as means of Illustration."
• (uncountable) The state of being found or proved guilty.
  "From G. R. Ratts , Game Warden , fines collected on conviction of violation of State game law ."