instillation instill • instillator · · · Info · Definitions · Synonyms · Characters · · instillation · · Text Latin · · Script 12 · · Length Definitions · · · (noun) the introduction of a liquid (by pouring or injection) drop by drop. Synonyms: instillment, instilment. · · Noun Definition 1 (noun) a liquid that is instilled drop by drop. · · Noun Definition 2 Synonyms · · · instillment · · Synonym 1 instilment · · Synonym 2 Characters · · a latin small letter a U+0061 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F s latin small letter s U+0073 t latin small letter t U+0074