DOT

noun

1. A small, round spot.
2. (grammar) A punctuation mark used to indicate the end of a sentence or an abbreviated part of a word; a full stop; a period.
3. A point used as a diacritical mark above or below various letters of the Latin script, as in Ȧ, Ạ, Ḅ, Ḃ, Ċ.

verb

1. To cover with small spots (of some liquid).
2. To add a dot (the symbol) or dots to.
3. To mark by means of dots or small spots.

preposition

1. Dot product of the previous vector and the following vector.