1 : (used of verbs) having standard (or regular) inflection
2 : conforming to a standard or pattern; "following the regular procedure of the legislature"; "a regular electrical outlet"
3 : being neither good nor bad; "an indifferent performance"; "a gifted painter but an indifferent actor"; "her work at the office is passable"; "a so-so golfer"; "feeling only so-so"; "prepared a tolerable dinner"; "a tolerable working knowledge of French"
4 : relating to a person who does something regularly; "a regular customer"; "a steady drinker"
5 : lacking exceptional quality or ability; "a novel of average merit"; "only a fair performance of the sonata"; "in fair health"; "the caliber of the students has gone from mediocre to above average"; "the performance was middling at best"
