"Full year" or "complete year" means all four digits of the year, i.e., the century and the years within the century. The "entire year" means that something is applicable for all 12 months of the year.
"Century" refers to the first two digits of a full year, i.e., the cardinal numbers representing the century. Century does not apply to the ordinal numbers representing the centuries, e.g., 20th century (referring to the 1900s).
"Year" refers to the last two digits of the full year, unless by context it refers to the full year.
"Reduce [some number] by the largest multiple of 7 (or 28)." This means to subtract from some number the largest multiple of 7 (7, 14, 21, 28, 35, etc.) or 28 (28, 56, 84) contained in it. Another way to say this is the remove the excess 7s (or 28s) contained in the number in order to bring it down to some number 0 to 6 (or 0 to 27). Another way to say is to reduce the number to a base of 7 (or 28). If the number is already to the base 7 (or 28), it does not need to be reduced (needs to be reduced by 0). The reason we do this is because the weekly calendar repeats itself every seven days and so the ultimate number we are looking for is between 1 and 7 (actually, 0 to 6 in the method describe on this site). We really only need to do it once at the end of the technique, but the reason we do it elsewhere in the technique is to make the numbers more manageable to deal with in our head.
"Day" is the number of the day in the month in the Date.
'Weekday" means the same as Day-of-Week, i.e., Sunday, Monday, Tuesday, etc.
"DOW" means Day-of-Week. It can refer to either the mathematical representation of the weekday or the weekday itself, depending upon context.
"Formula" means the mathematics used in the Day-of-Week technique.
More Coming Soon. If you think I need to define a particular term or word, please post a comment to that effect here or at the Help Desk.
