overlap

From Wiktionary
overlap is on the Academic Word List.

Word parts[change]

over- + lap

Pronunciation[change]

Verb[change]

Plain form
overlap

Third-person singular
overlaps

Past tense
overlapped

Past participle
overlapped

Present participle
overlapping

  1. Something overlaps on another thing if part of it is on top of, or at the same time as, the other thing.
    The shingles of a roof need to overlap to keep rain out.
    The shifts of the two workers (periods of time when they're working) need to overlap so that one worker can tell the other one what is happening.

Noun[change]

Singular
overlap

Plural
overlaps

  1. The act of overlapping. The amount that two things overlap on each other.
    More overlap keeps the rain out better, but needs more shingles to cover the roof.