imp.

{{grammar|not comparable}} {{abbreviation of|imperfect|dot=}}<ref name="Web">''Webster’s Revised Unabridged Dictionary'' (1913) uses {{term||imp.}} as an abbreviation for {{term|imperfect|lang=en}} in the conjugation sections of its entries.</ref>; also {{term|imperf.|lang=en}}, {{term|impf.|lang=en}}, {{term|impft|lang=en}}.