Function of the Full Stop: Sentences are building blocks which make sense and when they come to an end, a ‘full stop’ is used. Wiki User. In acronyms and initialisms, full stops are somewhat more often placed after each initial in American English (for example, U.S. and U.S.S.R.) than in British English (US and USSR), but this depends much full stop definition: 1. the symbol . Full stop definition is - a point . The period is a punctuation mark primarily used to indicate the end of a sentence. used in writing at the end of a sentence or at the end of the short form of a word…. It appears as a … Learn more. What is the function of the punctuation mark full stop? which you use at the end of a sentence when it is... | Meaning, pronunciation, translations and examples Top Answer. Full stop definition: A full stop is the punctuation mark . The period is a punctuation mark primarily used to indicate the end of a sentence. 2015-02-13 16:52:14 2015-02-13 16:52:14 "Full stop" is the end of a sentence.