In the Greek language there are a few meanings for love. For example, the words; Eros and Agape. Eros does very well on Valentine's day; romance, flowers, chocolates, cards etc. Agape would be a deeper love. It is a love that puts others first, a love that walks the road of life, a love that is unconditional. In Irish, the word cion would mean a love that is skin deep (I love ice-cream) whereas grá means a deeper love.
Incidentally, the Latin word 'Caritas' or Charity, here means unconditional love. That is the love that last long after Valentine's day is over.
Happy Valentine's day! and as the old saying goes, say it with Flowers.