Haplography – verb:
the practice or an act of inadvertently writing a letter or word once, when it should have been repeated
the omission in writing or copying of one of two or more adjacent and similar letters, syllables, words, or lines
Notes: These are two different definitions for the same word. Obviously. The first definition is sourced from the Oxford English Dictionary. The second is from the Merriam-Webster.
I do this only to point out that definitions for the same word, pulled from different sources, can reference similar, but critically important differences.