AstrologicalDictionary.com

Lagna - Ascendant - The Eastern Horizon of the place. The Sign rising at the Eastern Horizon. For instance if the date of birth is say 05th JAN the sign rising at the Eastern Horizon at the time of Sunrise is Sagittarius. This is known as Sagittarius Ascendant or Dhanus Lagna.
Law of Correspondences - Philosophers say that all things are knowable, as being from One Essence, they correspond. There is correspondence between Heaven and Earth, between Mind and Matter, between the parts and the Whole.

Lord - Lord of the star. All stars have lords. For instance Alpha Arietis or Aswathi is owned by Ketu. Revathi or Zeta Piscium is owned by Mercury.

Lunar Ascendant - The Sign where the Moon is posited. If the Moon is in Cancer, Cancer is the Lunar Ascendant.

Lunation - The Moon 12 degrees from the Sun; the first is called Prathama ( 0-12), the second Dwitheeya ( 12-24) and so on

Prathama First Lunation
Dwitheeya Second Lunation
Thriteeya Third Lunation
Chathurthi Fourth Lunation
Panchami Fifth Lunation
Shasthi Sixth Lunation
Sapthami Seventh Lunation
Ashtami Eighth Lunation
Navami Ninth Lunation
Dasami Tenth Lunation
Ekadasi Eleventh Lunation
Dwadasi Twelvth Lunation
Thrayodasi Thirteenth Lunation
Chaturdasi Fourteenth Lunation