"branch [verb]" ""
"checkout [noun]" ""
"checkout [verb]" "The action of updating the working tree to a revision which was stored in the object database."
+"clone [verb]" ""
"commit [noun]" "A single point in the git history."
"commit [verb]" "The action of storing a new snapshot of the project's state in the git history."
"diff [noun]" ""
"diff [verb]" ""
"fast forward merge" "A fast-forward is a special type of merge where you have a revision and you are merging another branch's changes that happen to be a descendant of what you have."
"fetch" "Fetching a branch means to get the branch's head from a remote repository, to find out which objects are missing from the local object database, and to get them, too."
+"hunk" "One context of consecutive lines in a whole patch, which consists of many such hunks"
"index (in git-gui: staging area)" "A collection of files. The index is a stored version of your working tree."
"merge [noun]" "A successful merge results in the creation of a new commit representing the result of the merge."
"merge [verb]" "To bring the contents of another branch into the current branch."
"message" ""
+"prune" "Deletes all stale tracking branches under <name>. These stale branches have already been removed from the remote repository referenced by <name>, but are still locally available in 'remotes/<name>'."
"pull" "Pulling a branch means to fetch it and merge it."
"push" "Pushing a branch means to get the branch's head ref from a remote repository, and ... (well, can someone please explain it for mere mortals?)"
"redo" ""
+"remote" "An other repository ('remote'). One might have a set of remotes whose branches one tracks."
"repository" "A collection of refs (?) together with an object database containing all objects which are reachable from the refs... (oops, you've lost me here. Again, please an explanation for mere mortals?)"
"reset" ""
"revert" ""
"update" ""
"verify" ""
"working copy, working tree" "The tree of actual checked out files."
+"ancestor" "a commit that succeeds the current one in git's graph of commits (not necessarily directly)"
+"abort" "prematurely stop and abandon an operation"
+"bare repository" "a repository with only .git directory, without working directory"
+"base" "a parent version of the current file"
+"blame" "get the authors responsible for each line in a file"
+"cherry-pick" "to select and apply a single commit without merging"
+"child" "a commit that directly succeeds the current one in git's graph of commits"
+"cleanup" "clean the state of the git repository, often after manually stopped operation"
+"commit message" "a message that gets attached with any commit"
+"descendant" "a commit that precedes the current one in git's graph of commits (not necessarily directly)"
+"detached checkout" "checkout of a revision rather than a some head"
+"file level merging" "any merge strategy that works on a file by file basis"
+"head" "the last revision in a branch"
+"hook" "script that gets executed automatically on some event"
+"initial checkout" "the first checkout during a clone operation"
+"local branch" "a branch that resides in the local git repository"
+"loose object" "a Git object that is not part of any pack"
+"master branch" "a branch called by convention 'master' that exists in a newly created git repository"
+"origin" "a remote called by convention 'origin' that the current git repository has been cloned from"
+"pack [noun]" "a file containing many git objects packed together"
+"packed object" "a Git object part of some pack"
+"parent" "a commit that directly precedes the current one in git's graph of commits"
+"reflog" "the log file containing all states of the HEAD reference (in other words past pristine states of the working copy)"
+"resolve (a conflict)" "decide which changes from alternative versions of a file should persist in Git"
+"revert changes" "abandon changes and go to pristine version"
+"revision expression" "expression that signifies a revision in git"
+"stage/unstage" "add some content of files and directories to the staging area in preparation for a commit"
+"stash" "temporarily save changes in a stack without committing"
+"tracked/untracked" "file whose content is tracked/not tracked by git"