| Word: Series
of one or more letters without spaces (when written), and marked off
from other terms by spaces or other signs
that mark the first or last letter of a word, that represents an idea
of something in some language.
Sometimes a word - in a natural
language - is defined as "the smallest meaningful unit" in a language,
but that tends to be false in as much as many languages have
modifications of words - cases, negations, temporal affixes - that only
occur as parts of words but have their own meaning. In English,
examples are "un" and "ab" for expressing denial
or complementation (as in "unnatural", "abnormal").