Intercalate

Adventures in Logophilia, Day 172:

intercalate

to insert a day into a calendar, or to insert between or among already existing layers or elements.  Every four years we intercalate February 29, otherwise known as Leap Day.

Matt Preston

I've always had this strange fantasy of mixing up the months which contain 30 days with the those containing 31 days.  It would be an easy mistake to make, wouldn't it?  I don't know much about our calendar and why certain months were given a certain number of days to total out to 365 or 366.  I imagine that if we had to insert another day into our calendar to, say, balance out dramatic changes in time, adding days to November, February, April, June and September would be an easy change.  There's a science fiction story brewing here.  I just know it.  Dibs!

Tessera

Adventures in Logophilia, Day 171:

tessera

A tessera was a small tablet made of wood, clay or bone, which the Romans used as a ticket, tally-token, voucher or even a means of ID.  These came into play in The Hunger Games, as the number of tessera traded and bargained for by eligible candidates for the Games could mean the difference between surviving and starving under the rule of Panem.  It is just one of many Roman flavors Suzanne Collins gave her series. 

Quincunx

Adventures in Logophilia, Day 170:

quincunx

an arrangement of five things in a square in a square or rectangle, one at each corner and one in the middle.  I always think of five pillars when this word comes up: four pillars holding up a structure at each of the distinct corners, the fifth secretly holding up the middle. 

A series of quincunx from an ancient puzzle.

Univocal

Adventures in Logophilia, Day 169:

univocal

This adjective indicates "only one meaning", unambiguous, and quite clear.

Lemniscate

Adventures in Logophilia, Day 168:

lemniscate

the symbol representing infinity, or (to be more mathematical) a figure-eight shaped curve whose polar coordinates are p²=a² .  This is from the Latin word lemniscata, meaning "hanging ribbons."