-cede, -ceed, -cess, -cease

(Latin: to be in motion; to go, to go away, to yield, to give up, to withdraw)

precession (noun), precessions (pl)
1. The act of leading something, as in a line up, personal importance, etc: The precession of the guests of honour at the banquet was written out for the wait staff to understand.
2. In astronomy: the slow, conical motion of the earth's axis of rotation: Precession is caused by the gravitational attraction of the sun and moon, and, to a smaller extent, of the planets, on the equatorial bulge of the earth.

In certain contexts, precession may refer to the precession that the Earth experiences, or the effects of this type of precession on astronomical observation, or to the precession of orbital objects.

predecease
To die before another person.
predecessor (s) (noun), predecessors (pl)
1. Someone who precedes another person in time; such as, in holding a position or office in public office or business.
2. Something previously in use or existence that has been replaced or succeeded by something else.
procedure (s) (noun), procedures (pl)
1. A mode of conducting legal and parliamentary proceedings.
2. A particular course of action intended to achieve a result; an established or correct method of doing something: "We had to follow a procedure for completing our tax form."
3. A process or series of acts; especially, of a practical or mechanical nature involved in a particular form of work; any means of doing or accomplishing something.
4. Etymology: "fact" or "manner of proceeding", from French procédure, "manner of proceeding"; from Old French proceder, from Latin procedere, "to go forward, to advance"; from pro-, "forward" + cedere, "to go".
proceed (verb), proceeds; proceeded; proceeding
1. To move ahead; to travel onward in time or space.
2. To go on or forward; especially, after a stop or interruption.
3. To begin and to carry on an action or process.
4. To bring legal action against someone.
5. Etymology: from Old French proceder, from Latin procedere "to go forward, to advance; from pro-, "forward" + cedere, "to go, to leave".
proceeding
1. An act or course of action; also, a particular act or course of action.
2. The act of someone who or that which goes forward.
proceedings
1. The records or minutes of the meetings of a society, etc.
2. In law, any action instituted in a court.
3. Any of the various steps taken in a cause; such as, a proceeding by legal writ of error.
proceeds
1. The useful or material results of an action or course; also, that which comes from such action.
2. The amount derived from the disposal of goods, work, or the use of financial investments.
3. Money derived from a sale or other commercial transaction.
process (verb), processes; processed; processing
1. A series of continuous actions directed toward a specific objective which bring about a particular result, end, or condition."
2. A series of natural occurrences that produce change or development.
3. The entire proceedings in a lawsuit.
4. A summons or writ ordering someone to appear in court.
5. In biology, a part that naturally grows on or sticks out on an organism.
6. Etymology: "fact of being carried on"; that is "in process", from Old French proces, "journey"; from Latin processus, "process, advance, progress"; from the past participle stem of procedere, "to go forward".
procession (pruh SESH uhn) (s) (noun), processions (pl)
1. The forward movement of a group of people or vehicles as part of a celebration, commemoration, or demonstration: The funeral procession for Tony’s father, who passed away suddenly, was very small because it included only close members of his family.
2. The act of moving ahead toward a goal: The college students were in a procession to the football stadium in hopes of seeing their team win the championship.
processional (s) (noun), processionals (pl)
1. A piece of music suitable for accompanying a procession.
2. A hymn or other piece of music that accompanies the entry of the clergy into a church.
3. A book of hymns and prayers for use during a religious procession.
processioner (s) (noun), processioners (pl)
1. A manual of processions; a processional.
2. Anyone who takes part in a procession.
reaccede
1. To comply with; consent to, approve; concede, yield to, acquiesce again.
2. To repeat an agreement with or to comply with again.
recede (verb), recedes; receded; receding
1. To move back or away from a limit, point, or mark; for example, the people waited for the flood waters to recede before they could return to their homes.
2. To slope backward.
3. To become or seem to become fainter or more distant.
4. To withdraw or to retreat.
5. Etymology: from French receder, from Latin recedere, "to go back, to withdraw"; from re-, "back" + cedere, "to go".
recess (s) (noun), recesses (pl)
1. A depression or indentation in any otherwise continuous line or surface; especially, in a wall; a niche; an alcove; or a cavity.
2. A time of cessation from employment or occupation or a break from classes during the school day or year: "The school had another recess from classes today."
3. A period during which no work or business is done; specifically, a long period in which a legislative body is not sitting in session or a short break during court proceedings.
4. Etymology: "act of receding", from Latin recessus, "a going back, a retreat"; from recessum, the past participle of recedere, "to recede".

Go to this link for an important clarification of "Seed" words which are often misused by users.