describes contexts, situations, numbers, measures, instruments, etc. of which the learner has some prior knowledge or experience.
within normal everyday experience; common and ordinary; not strange; "familiar ordinary objects found in every home"; "a familiar everyday scene"; "a familiar excuse"; "a day like any other filled with familiar duties and experiences"
describes people, contexts, situations, words, sources, numbers, measures, shapes, objects etc. of which the learner has considerable prior knowledge or experience.